diff --git a/htdocs/core/boxes/box_produits.php b/htdocs/core/boxes/box_produits.php
old mode 100644
new mode 100755
index d3772ff65f1..2a9b9e984a4
--- a/htdocs/core/boxes/box_produits.php
+++ b/htdocs/core/boxes/box_produits.php
@@ -63,7 +63,7 @@ class box_produits extends ModeleBoxes
 
 		if ($user->rights->produit->lire || $user->rights->service->lire)
 		{
-			$sql = "SELECT p.rowid, p.label, p.price, p.price_base_type, p.price_ttc, p.fk_product_type, p.tms, p.tosell, p.tobuy";
+			$sql = "SELECT p.rowid, p.label, p.price, p.price_base_type, p.price_ttc, p.fk_product_type, p.tms, p.tosell, p.tobuy, p.fk_price_expression";
 			$sql.= " FROM ".MAIN_DB_PREFIX."product as p";
 			$sql.= ' WHERE p.entity IN ('.getEntity($productstatic->element, 1).')';
 			if (empty($user->rights->produit->lire)) $sql.=' AND p.fk_product_type != 0';
@@ -106,17 +106,37 @@ class box_produits extends ModeleBoxes
 					$this->info_box_contents[$i][1] = array('td' => 'align="left"',
                     'text' => $objp->label,
                     'url' => DOL_URL_ROOT."/product/card.php?id=".$objp->rowid);
-
-					if ($objp->price_base_type == 'HT')
-					{
-						$price=price($objp->price);
-						$price_base_type=$langs->trans("HT");
-					}
-					else
-					{
-						$price=price($objp->price_ttc);
-						$price_base_type=$langs->trans("TTC");
-					}
+	                if (empty($objp->fk_price_expression)) {
+						if ($objp->price_base_type == 'HT')
+						{
+							$price=price($objp->price);
+							$price_base_type=$langs->trans("HT");
+						}
+						else
+						{
+							$price=price($objp->price_ttc);
+							$price_base_type=$langs->trans("TTC");
+						}
+	                }
+	                else //Parse the dinamic price
+	               	{
+						$product = new Product($this->db);
+						$product->fetch($objp->rowid, '', '', 1);
+	                    $priceparser = new PriceParser($this->db);
+	                    $price_result = $priceparser->parseProduct($product);
+	                    if ($price_result >= 0) {
+							if ($objp->price_base_type == 'HT')
+							{
+								$price_base_type=$langs->trans("HT");
+							}
+							else
+							{
+								$price_result = $price_result * (1 + ($product->tva_tx / 100));
+								$price_base_type=$langs->trans("TTC");
+							}
+							$price=price($price_result);
+	                    }
+	               	}
 					$this->info_box_contents[$i][2] = array('td' => 'align="right"',
                     'text' => $price);
 
diff --git a/htdocs/core/boxes/box_produits_alerte_stock.php b/htdocs/core/boxes/box_produits_alerte_stock.php
old mode 100644
new mode 100755
index 1079f623492..91e2372e5c8
--- a/htdocs/core/boxes/box_produits_alerte_stock.php
+++ b/htdocs/core/boxes/box_produits_alerte_stock.php
@@ -114,16 +114,37 @@ class box_produits_alerte_stock extends ModeleBoxes
                     'text' => $objp->label,
                     'url' => DOL_URL_ROOT."/product/card.php?id=".$objp->rowid);
 
-					if ($objp->price_base_type == 'HT')
-					{
-						$price=price($objp->price);
-						$price_base_type=$langs->trans("HT");
-					}
-					else
-					{
-						$price=price($objp->price_ttc);
-						$price_base_type=$langs->trans("TTC");
-					}
+	                if (empty($objp->fk_price_expression)) {
+						if ($objp->price_base_type == 'HT')
+						{
+							$price=price($objp->price);
+							$price_base_type=$langs->trans("HT");
+						}
+						else
+						{
+							$price=price($objp->price_ttc);
+							$price_base_type=$langs->trans("TTC");
+						}
+	                }
+	                else //Parse the dinamic price
+	               	{
+						$product = new Product($this->db);
+						$product->fetch($objp->rowid, '', '', 1);
+	                    $priceparser = new PriceParser($this->db);
+	                    $price_result = $priceparser->parseProduct($product);
+	                    if ($price_result >= 0) {
+							if ($objp->price_base_type == 'HT')
+							{
+								$price_base_type=$langs->trans("HT");
+							}
+							else
+							{
+								$price_result = $price_result * (1 + ($product->tva_tx / 100));
+								$price_base_type=$langs->trans("TTC");
+							}
+							$price=price($price_result);
+	                    }
+	               	}
 					$this->info_box_contents[$i][2] = array('td' => 'align="right"',
                     'text' => $price);
 
diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 97039adea57..51a893832b1 100755
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -1466,7 +1466,7 @@ class Form
         $outarray=array();
 
         $sql = "SELECT ";
-        $sql.= " p.rowid, p.label, p.ref, p.description, p.fk_product_type, p.price, p.price_ttc, p.price_base_type, p.tva_tx, p.duration, p.stock";
+        $sql.= " p.rowid, p.label, p.ref, p.description, p.fk_product_type, p.price, p.price_ttc, p.price_base_type, p.tva_tx, p.duration, p.stock, p.fk_price_expression";
 
         //Price by customer
         if (! empty($conf->global->PRODUIT_CUSTOMER_PRICES) && !empty($socid)) {
@@ -1545,6 +1545,8 @@ class Form
         $result=$this->db->query($sql);
         if ($result)
         {
+            require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
+            require_once DOL_DOCUMENT_ROOT.'/product/class/priceparser.class.php';
             $num = $this->db->num_rows($result);
 
             $out.='<select class="flat" name="'.$htmlname.'" id="'.$htmlname.'">';
@@ -1594,6 +1596,19 @@ class Form
 				}
 				else
 				{
+                    if (!empty($objp->fk_price_expression)) {
+                        $price_product = new Product($this->db);
+                        $price_product->fetch($objp->rowid, '', '', 1);
+                        $priceparser = new PriceParser($this->db);
+                        $price_result = $priceparser->parseProduct($price_product);
+                        if ($price_result >= 0) {
+                            $objp->price = $price_result;
+                            $objp->unitprice = $price_result;
+                            //Calculate the VAT
+                            $objp->price_ttc = price2num($objp->price) * (1 + ($objp->tva_tx / 100));
+                            $objp->price_ttc = price2num($objp->price_ttc,'MU');
+                        }
+                    }
 					$this->constructProductListOption($objp, $opt, $optJson, $price_level, $selected);
 					// Add new entry
 					// "key" value of json key array is used by jQuery automatically as selected value
@@ -1875,7 +1890,7 @@ class Form
 
         $sql = "SELECT p.rowid, p.label, p.ref, p.price, p.duration,";
         $sql.= " pfp.ref_fourn, pfp.rowid as idprodfournprice, pfp.price as fprice, pfp.quantity, pfp.remise_percent, pfp.remise, pfp.unitprice,";
-        $sql.= " pfp.fk_price_expression, pfp.fk_product, pfp.tva_tx, s.nom as name";
+        $sql.= " pfp.fk_supplier_price_expression, pfp.fk_product, pfp.tva_tx, s.nom as name";
         $sql.= " FROM ".MAIN_DB_PREFIX."product as p";
         $sql.= " LEFT JOIN ".MAIN_DB_PREFIX."product_fournisseur_price as pfp ON p.rowid = pfp.fk_product";
         if ($socid) $sql.= " AND pfp.fk_soc = ".$socid;
@@ -1957,9 +1972,9 @@ class Form
                 {
                     $outqty=$objp->quantity;
 					$outdiscount=$objp->remise_percent;
-                    if (!empty($objp->fk_price_expression)) {
+                    if (!empty($objp->fk_supplier_price_expression)) {
                         $priceparser = new PriceParser($this->db);
-                        $price_result = $priceparser->parseProductSupplier($objp->fk_product, $objp->fk_price_expression, $objp->quantity, $objp->tva_tx);
+                        $price_result = $priceparser->parseProductSupplier($objp->fk_product, $objp->fk_supplier_price_expression, $objp->quantity, $objp->tva_tx);
                         if ($price_result >= 0) {
                             $objp->fprice = $price_result;
                             if ($objp->quantity >= 1)
@@ -2056,7 +2071,7 @@ class Form
 
         $sql = "SELECT p.rowid, p.label, p.ref, p.price, p.duration,";
         $sql.= " pfp.ref_fourn, pfp.rowid as idprodfournprice, pfp.price as fprice, pfp.quantity, pfp.unitprice,";
-        $sql.= " pfp.fk_price_expression, pfp.fk_product, pfp.tva_tx, s.nom as name";
+        $sql.= " pfp.fk_supplier_price_expression, pfp.fk_product, pfp.tva_tx, s.nom as name";
         $sql.= " FROM ".MAIN_DB_PREFIX."product as p";
         $sql.= " LEFT JOIN ".MAIN_DB_PREFIX."product_fournisseur_price as pfp ON p.rowid = pfp.fk_product";
         $sql.= " LEFT JOIN ".MAIN_DB_PREFIX."societe as s ON pfp.fk_soc = s.rowid";
@@ -2096,9 +2111,9 @@ class Form
                     }
                     $opt.= '>'.$objp->name.' - '.$objp->ref_fourn.' - ';
 
-                    if (!empty($objp->fk_price_expression)) {
+                    if (!empty($objp->fk_supplier_price_expression)) {
                         $priceparser = new PriceParser($this->db);
-                        $price_result = $priceparser->parseProductSupplier($objp->fk_product, $objp->fk_price_expression, $objp->quantity, $objp->tva_tx);
+                        $price_result = $priceparser->parseProductSupplier($objp->fk_product, $objp->fk_supplier_price_expression, $objp->quantity, $objp->tva_tx);
                         if ($price_result >= 0) {
                             $objp->fprice = $price_result;
                             if ($objp->quantity >= 1)
diff --git a/htdocs/fourn/ajax/getSupplierPrices.php b/htdocs/fourn/ajax/getSupplierPrices.php
index e14e872a24f..e3bb29ad228 100755
--- a/htdocs/fourn/ajax/getSupplierPrices.php
+++ b/htdocs/fourn/ajax/getSupplierPrices.php
@@ -52,7 +52,7 @@ if ($idprod > 0)
 	$sql = "SELECT p.rowid, p.label, p.ref, p.price, p.duration,";
 	$sql.= " pfp.ref_fourn,";
 	$sql.= " pfp.rowid as idprodfournprice, pfp.price as fprice, pfp.remise_percent, pfp.quantity, pfp.unitprice, pfp.charges, pfp.unitcharges,";
-	$sql.= " pfp.fk_price_expression, pfp.tva_tx, s.nom as name";
+	$sql.= " pfp.fk_supplier_price_expression, pfp.tva_tx, s.nom as name";
 	$sql.= " FROM ".MAIN_DB_PREFIX."product_fournisseur_price as pfp";
 	$sql.= " LEFT JOIN ".MAIN_DB_PREFIX."product as p ON p.rowid = pfp.fk_product";
 	$sql.= " LEFT JOIN ".MAIN_DB_PREFIX."societe as s ON s.rowid = pfp.fk_soc";
@@ -76,9 +76,9 @@ if ($idprod > 0)
 			{
 				$objp = $db->fetch_object($result);
 
-                if (!empty($objp->fk_price_expression)) {
+                if (!empty($objp->fk_supplier_price_expression)) {
                     $priceparser = new PriceParser($db);
-                    $price_result = $priceparser->parseProductSupplier($idprod, $objp->fk_price_expression, $objp->quantity, $objp->tva_tx);
+                    $price_result = $priceparser->parseProductSupplier($idprod, $objp->fk_supplier_price_expression, $objp->quantity, $objp->tva_tx);
                     if ($price_result >= 0) {
                         $objp->fprice = $price_result;
                         if ($objp->quantity >= 1)
diff --git a/htdocs/fourn/class/fournisseur.product.class.php b/htdocs/fourn/class/fournisseur.product.class.php
index 52b9fc80c21..76577dc9ea6 100755
--- a/htdocs/fourn/class/fournisseur.product.class.php
+++ b/htdocs/fourn/class/fournisseur.product.class.php
@@ -56,7 +56,7 @@ class ProductFournisseur extends Product
     var $fourn_unitprice;
     var $fourn_tva_npr;
 
-    var $fk_price_expression;
+    var $fk_supplier_price_expression;
 
 
     /**
@@ -330,7 +330,7 @@ class ProductFournisseur extends Product
     function fetch_product_fournisseur_price($rowid, $ignore_expression = 0)
     {
         $sql = "SELECT pfp.rowid, pfp.price, pfp.quantity, pfp.unitprice, pfp.remise_percent, pfp.remise, pfp.tva_tx, pfp.fk_availability,";
-        $sql.= " pfp.fk_soc, pfp.ref_fourn, pfp.fk_product, pfp.charges, pfp.unitcharges, pfp.fk_price_expression"; // , pfp.recuperableonly as fourn_tva_npr";  FIXME this field not exist in llx_product_fournisseur_price
+        $sql.= " pfp.fk_soc, pfp.ref_fourn, pfp.fk_product, pfp.charges, pfp.unitcharges, pfp.fk_supplier_price_expression"; // , pfp.recuperableonly as fourn_tva_npr";  FIXME this field not exist in llx_product_fournisseur_price
         $sql.= " FROM ".MAIN_DB_PREFIX."product_fournisseur_price as pfp";
         $sql.= " WHERE pfp.rowid = ".$rowid;
 
@@ -350,16 +350,16 @@ class ProductFournisseur extends Product
             	$this->fourn_remise             = $obj->remise;
             	$this->fourn_unitprice          = $obj->unitprice;
             	$this->fourn_unitcharges        = $obj->unitcharges;
-            	$this->tva_tx					= $obj->tva_tx;
+            	$this->fourn_tva_tx					= $obj->tva_tx;
             	$this->product_id				= $obj->fk_product;	// deprecated
             	$this->fk_product				= $obj->fk_product;
             	$this->fk_availability			= $obj->fk_availability;
             	//$this->fourn_tva_npr			= $obj->fourn_tva_npr; // FIXME this field not exist in llx_product_fournisseur_price
-                $this->fk_price_expression      = $obj->fk_price_expression;
+                $this->fk_supplier_price_expression      = $obj->fk_supplier_price_expression;
 
-                if (empty($ignore_expression) && !empty($this->fk_price_expression)) {
+                if (empty($ignore_expression) && !empty($this->fk_supplier_price_expression)) {
                     $priceparser = new PriceParser($this->db);
-                    $price_result = $priceparser->parseProductSupplier($this->fk_product, $this->fk_price_expression, $this->fourn_qty, $this->fourn_tva_tx);
+                    $price_result = $priceparser->parseProductSupplier($this->fk_product, $this->fk_supplier_price_expression, $this->fourn_qty, $this->fourn_tva_tx);
                     if ($price_result >= 0) {
                     	$this->fourn_price = $price_result;
                     	//recalculation of unitprice, as probably the price changed...
@@ -402,7 +402,7 @@ class ProductFournisseur extends Product
         global $conf;
 
         $sql = "SELECT s.nom as supplier_name, s.rowid as fourn_id,";
-        $sql.= " pfp.rowid as product_fourn_pri_id, pfp.ref_fourn, pfp.fk_product as product_fourn_id, pfp.fk_price_expression,";
+        $sql.= " pfp.rowid as product_fourn_pri_id, pfp.ref_fourn, pfp.fk_product as product_fourn_id, pfp.fk_supplier_price_expression,";
         $sql.= " pfp.price, pfp.quantity, pfp.unitprice, pfp.remise_percent, pfp.remise, pfp.tva_tx, pfp.fk_availability, pfp.charges, pfp.unitcharges, pfp.info_bits";
         $sql.= " FROM ".MAIN_DB_PREFIX."product_fournisseur_price as pfp";
         $sql.= ", ".MAIN_DB_PREFIX."societe as s";
@@ -439,11 +439,11 @@ class ProductFournisseur extends Product
                 $prodfourn->fk_availability			= $record["fk_availability"];
                 $prodfourn->id						= $prodid;
                 $prodfourn->fourn_tva_npr						= $record["info_bits"];
-                $prodfourn->fk_price_expression     = $record["fk_price_expression"];
+                $prodfourn->fk_supplier_price_expression     = $record["fk_supplier_price_expression"];
 
-                if (!empty($prodfourn->fk_price_expression)) {
+                if (!empty($prodfourn->fk_supplier_price_expression)) {
                     $priceparser = new PriceParser($this->db);
-                    $price_result = $priceparser->parseProductSupplier($prodid, $prodfourn->fk_price_expression, $prodfourn->fourn_qty, $prodfourn->fourn_tva_tx);
+                    $price_result = $priceparser->parseProductSupplier($prodid, $prodfourn->fk_supplier_price_expression, $prodfourn->fourn_qty, $prodfourn->fourn_tva_tx);
                     if ($price_result >= 0) {
                     	$prodfourn->fourn_price = $price_result;
                     	$prodfourn->fourn_unitprice = null; //force recalculation of unitprice, as probably the price changed...
@@ -476,11 +476,11 @@ class ProductFournisseur extends Product
     }
 
     /**
-     * 	Load properties for minimum price
+     *  Load properties for minimum price
      *
-     *  @param	int		$prodid	    Product id
-     *  @param	int		$qty		Minimum quantity
-     *  @return int					<0 if KO, >0 if OK
+     *  @param  int     $prodid     Product id
+     *  @param  int     $qty        Minimum quantity
+     *  @return int                 <0 if KO, >0 if OK
      */
     function find_min_price_product_fournisseur($prodid, $qty=0)
     {
@@ -491,45 +491,84 @@ class ProductFournisseur extends Product
         $this->fourn_ref              = '';
         $this->fourn_price            = '';
         $this->fourn_qty              = '';
-		$this->fourn_remise_percent   = '';
-		$this->fourn_remise           = '';
+        $this->fourn_remise_percent   = '';
+        $this->fourn_remise           = '';
         $this->fourn_unitprice        = '';
-        $this->fourn_id			      = '';
-        $this->fourn_name			  = '';
-        $this->id					  = '';
+        $this->fourn_id               = '';
+        $this->fourn_name             = '';
+        $this->id                     = '';
 
         $sql = "SELECT s.nom as supplier_name, s.rowid as fourn_id,";
         $sql.= " pfp.rowid as product_fourn_price_id, pfp.ref_fourn,";
         $sql.= " pfp.price, pfp.quantity, pfp.unitprice, pfp.tva_tx, pfp.charges, pfp.unitcharges, ";
-        $sql.= " pfp.remise, pfp.remise_percent, pfp.fk_price_expression";
+        $sql.= " pfp.remise, pfp.remise_percent, pfp.fk_supplier_price_expression";
         $sql.= " FROM ".MAIN_DB_PREFIX."societe as s, ".MAIN_DB_PREFIX."product_fournisseur_price as pfp";
         $sql.= " WHERE s.entity IN (".getEntity('societe', 1).")";
         $sql.= " AND pfp.fk_product = ".$prodid;
         $sql.= " AND pfp.fk_soc = s.rowid";
         if ($qty > 0) $sql.= " AND pfp.quantity <= ".$qty;
-        $sql.= " ORDER BY pfp.unitprice";
-        $sql.= $this->db->plimit(1);
 
         dol_syslog(get_class($this)."::find_min_price_product_fournisseur", LOG_DEBUG);
 
         $resql = $this->db->query($sql);
         if ($resql)
         {
-            $record = $this->db->fetch_array($resql);
-            $this->product_fourn_price_id	= $record["product_fourn_price_id"];
-            $this->fourn_ref				= $record["ref_fourn"];
-            $this->fourn_price				= $record["price"];
-            $this->fourn_qty				= $record["quantity"];
-            $this->fourn_remise_percent		= $record["remise_percent"];
-            $this->fourn_remise				= $record["remise"];
-            $this->fourn_unitprice			= $record["unitprice"];
-            $this->fourn_charges			= $record["charges"];
-            $this->fourn_unitcharges		= $record["unitcharges"];
-            $this->fourn_tva_tx				= $record["tva_tx"];
-            $this->fourn_id					= $record["fourn_id"];
-            $this->fourn_name				= $record["supplier_name"];
-            $this->fk_price_expression      = $record["fk_price_expression"];
-            $this->id						= $prodid;
+            $record_array = array();
+
+            //Store each record to array for later search of min
+            while ($record = $this->db->fetch_array($resql))
+            {
+                $record_array[]=$record;
+            }
+
+            if (count($record_array) == 0) 
+            {
+                $this->db->free($resql);
+                return 0;
+            }
+            else
+            {
+                $min = -1;
+                foreach($record_array as $record)
+                { 
+                    $fourn_price = $record["price"];
+                    $fourn_unitprice = $record["unitprice"];
+                    if (!empty($record["fk_supplier_price_expression"])) {
+                        $priceparser = new PriceParser($this->db);
+                        $price_result = $priceparser->parseProductSupplier($prodid, $record["fk_supplier_price_expression"], $record["quantity"], $record["tva_tx"]);
+                        if ($price_result >= 0) {
+                            $fourn_price = price2num($price_result,'MU');
+                            if ($record["quantity"] != 0)
+                            {
+                                $fourn_unitprice = price2num($fourn_price/$record["quantity"],'MU');
+                            }
+                            else
+                            {
+                                $fourn_unitprice = $fourn_price;
+                            }
+                        }
+                    }
+                    if ($fourn_unitprice < $min || $min == -1)
+                    {
+                        $this->product_fourn_price_id   = $record["product_fourn_price_id"];
+                        $this->fourn_ref                = $record["ref_fourn"];
+                        $this->fourn_price              = $fourn_price;
+                        $this->fourn_qty                = $record["quantity"];
+                        $this->fourn_remise_percent     = $record["remise_percent"];
+                        $this->fourn_remise             = $record["remise"];
+                        $this->fourn_unitprice          = $fourn_unitprice;
+                        $this->fourn_charges            = $record["charges"];
+                        $this->fourn_unitcharges        = $record["unitcharges"];
+                        $this->fourn_tva_tx             = $record["tva_tx"];
+                        $this->fourn_id                 = $record["fourn_id"];
+                        $this->fourn_name               = $record["supplier_name"];
+                        $this->fk_supplier_price_expression      = $record["fk_supplier_price_expression"];
+                        $this->id                       = $prodid;
+                        $min = $this->fourn_unitprice;
+                    }
+                }
+            }
+
             $this->db->free($resql);
             return 1;
         }
@@ -541,23 +580,24 @@ class ProductFournisseur extends Product
     }
 
     /**
-     *  Sets the price expression
+     *  Sets the supplier price expression
      *
-     *  @param  string  $expression_id	Expression
+     *  @param  int     $expression_id	Expression
      *  @return int                 	<0 if KO, >0 if OK
      */
-    function setPriceExpression($expression_id)
+    function setSupplierPriceExpression($expression_id)
     {
         global $conf;
 
         // Clean parameters
         $this->db->begin();
+        $expression_id = $expression_id != 0 ? $expression_id : 'NULL';
 
         $sql = "UPDATE ".MAIN_DB_PREFIX."product_fournisseur_price";
-        $sql.= " SET fk_price_expression = ".$expression_id;
+        $sql.= " SET fk_supplier_price_expression = ".$expression_id;
         $sql.= " WHERE rowid = ".$this->product_fourn_price_id;
 
-        dol_syslog(get_class($this)."::setPriceExpression", LOG_DEBUG);
+        dol_syslog(get_class($this)."::setSupplierPriceExpression", LOG_DEBUG);
 
         $resql = $this->db->query($sql);
         if ($resql)
diff --git a/htdocs/install/mysql/migration/3.7.0-3.8.0.sql b/htdocs/install/mysql/migration/3.7.0-3.8.0.sql
index cb70f85a32c..8729a775af6 100755
--- a/htdocs/install/mysql/migration/3.7.0-3.8.0.sql
+++ b/htdocs/install/mysql/migration/3.7.0-3.8.0.sql
@@ -18,14 +18,20 @@
 -- -- VPGSQL8.2 DELETE FROM llx_usergroup_user      WHERE fk_user      NOT IN (SELECT rowid from llx_user);
 -- -- VMYSQL4.1 DELETE FROM llx_usergroup_user      WHERE fk_usergroup NOT IN (SELECT rowid from llx_usergroup);
 
+
 --create table for price expressions and add column in product supplier
 create table llx_c_price_expression
 (
-  rowid     integer AUTO_INCREMENT PRIMARY KEY,
-  title     varchar(20) NOT NULL,
-  expression    varchar(80) NOT NULL
+  rowid      integer AUTO_INCREMENT PRIMARY KEY,
+  title      varchar(20) NOT NULL,
+  expression varchar(80) NOT NULL
 )ENGINE=innodb;
 
+ALTER TABLE llx_product_fournisseur_price ADD COLUMN fk_supplier_price_expression integer DEFAULT NULL;
+ALTER TABLE llx_product ADD COLUMN fk_price_expression integer DEFAULT NULL;
+ALTER TABLE llx_product_price ADD COLUMN fk_price_expression integer DEFAULT NULL;
+
+
 --create table for user conf of printing driver
 CREATE TABLE llx_printing 
 (
diff --git a/htdocs/install/mysql/tables/llx_product.sql b/htdocs/install/mysql/tables/llx_product.sql
old mode 100644
new mode 100755
index e9703fc90cf..03c5c5edd3c
--- a/htdocs/install/mysql/tables/llx_product.sql
+++ b/htdocs/install/mysql/tables/llx_product.sql
@@ -76,5 +76,6 @@ create table llx_product
   finished					tinyint      DEFAULT NULL,
   hidden					tinyint      DEFAULT 0,			-- Not used. Deprecated.
   import_key				varchar(14),					-- Import key
+  fk_price_expression integer,                     -- Link to the rule for dynamic price calculation
   desiredstock              integer      DEFAULT 0
 )ENGINE=innodb;
diff --git a/htdocs/install/mysql/tables/llx_product_fournisseur_price.sql b/htdocs/install/mysql/tables/llx_product_fournisseur_price.sql
index a0554d4345c..f3905ab4fbe 100755
--- a/htdocs/install/mysql/tables/llx_product_fournisseur_price.sql
+++ b/htdocs/install/mysql/tables/llx_product_fournisseur_price.sql
@@ -39,6 +39,6 @@ create table llx_product_fournisseur_price
   tva_tx				double(6,3) NOT NULL,
   info_bits				integer NOT NULL DEFAULT 0,
   fk_user				integer,
-  fk_price_expression	integer,                     -- Link to the rule for dynamic amount calculation
+  fk_supplier_price_expression	integer,                     -- Link to the rule for dynamic price calculation
   import_key			varchar(14)                  -- Import key
 )ENGINE=innodb;
diff --git a/htdocs/install/mysql/tables/llx_product_price.sql b/htdocs/install/mysql/tables/llx_product_price.sql
old mode 100644
new mode 100755
index e83fbdccc2c..1341c49dcaa
--- a/htdocs/install/mysql/tables/llx_product_price.sql
+++ b/htdocs/install/mysql/tables/llx_product_price.sql
@@ -38,6 +38,7 @@ create table llx_product_price
   fk_user_author	integer,
   tosell			tinyint DEFAULT 1,
   price_by_qty		integer NOT NULL DEFAULT 0,
+  fk_price_expression integer,                     -- Link to the rule for dynamic price calculation
   import_key 		varchar(14)
 )ENGINE=innodb;
 
diff --git a/htdocs/langs/en_US/products.lang b/htdocs/langs/en_US/products.lang
index a5dfb52d40c..ebc724edf5c 100755
--- a/htdocs/langs/en_US/products.lang
+++ b/htdocs/langs/en_US/products.lang
@@ -244,6 +244,9 @@ MinimumPriceLimit=Minimum price can't be lower that %s
 MinimumRecommendedPrice=Minimum recommended price is : %s
 PriceExpressionEditor=Price expression editor
 PriceExpressionSelected=Selected price expression
-PriceExpressionEditorHelp="price = 2 + 2" or "2 + 2" for setting the price<br>ExtraFields are variables like "#options_myextrafieldkey# * 2"<br>There are special variables like #quantity# and #tva_tx#<br>Use ; to separate expressions
+PriceExpressionEditorHelp1="price = 2 + 2" or "2 + 2" for setting the price. Use ; to separate expressions
+PriceExpressionEditorHelp2=You can access ExtraFields with variables like <b>#options_myextrafieldkey#</b>
+PriceExpressionEditorHelp3=In both product/service and supplier prices there are these variables available:<br><b>#tva_tx# #localtax1_tx# #localtax2_tx# #weight# #length# #surface# #price_min#</b>
+PriceExpressionEditorHelp4=In product/service price only: <b>#supplier_min_price#</b><br>In supplier prices only: <b>#supplier_quantity# and #supplier_tva_tx#</b>
 PriceMode=Price mode
 PriceNumeric=Number
diff --git a/htdocs/product/class/priceparser.class.php b/htdocs/product/class/priceparser.class.php
index 5e4fb949cbb..4907f015f8a 100755
--- a/htdocs/product/class/priceparser.class.php
+++ b/htdocs/product/class/priceparser.class.php
@@ -22,6 +22,7 @@
  */
 require_once DOL_DOCUMENT_ROOT.'/includes/evalmath/evalmath.class.php';
 require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
+require_once DOL_DOCUMENT_ROOT.'/fourn/class/fournisseur.product.class.php';
 require_once DOL_DOCUMENT_ROOT.'/product/class/priceexpression.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/extrafields.class.php';
 
@@ -121,12 +122,33 @@ class PriceParser
 	/**
 	 *	Calculates price based on expression
 	 *
-	 *	@param	array  	$values     	Strings to replaces
+	 *	@param	Product	$product    	The Product object to get information
 	 *	@param	String 	$expression     The expression to parse
-     *  @return int 					> 0 if OK, < 1 if KO
+	 *	@param	array  	$values     	Strings to replaces
+	 *  @return int 					> 0 if OK, < 1 if KO
 	 */
-	public function parseExpression($values, $expression)
+	public function parseExpression($product, $expression, $values)
 	{
+		//Accessible product values by expressions
+		$values = array_merge($values, array(
+			"tva_tx" => $product->tva_tx,
+			"localtax1_tx" => $product->localtax1_tx,
+			"localtax2_tx" => $product->localtax2_tx,
+			"weight" => $product->weight,
+			"length" => $product->length,
+			"surface" => $product->surface,
+			"price_min" => $product->price_min,
+		));
+
+		//Retreive all extrafield for product and add it to values
+		$extrafields = new ExtraFields($this->db);
+		$extralabels = $extrafields->fetch_name_optionals_label('product', true);
+		$product->fetch_optionals($product->id, $extralabels);
+		foreach ($extrafields->attribute_label as $key=>$label)
+		{
+			$values['options_'.$key] = $product->array_options['options_'.$key];
+		}
+
 		//Check if empty
 		$expression = trim($expression);
 		if (empty($expression))
@@ -182,37 +204,79 @@ class PriceParser
 		return $vars["price"];
 	}
 
+	/**
+	 *	Calculates product price based on product id and string expression
+	 *
+	 *	@param	Product				$product    	The Product object to get information
+	 *	@param	string 				$expression     The expression to parse
+	 *	@param	array 				$extra_values   Any aditional values for expression
+     *  @return int 				> 0 if OK, < 1 if KO
+	 */
+	public function parseProductExpression($product, $expression, $extra_values = array())
+	{
+		//Get the supplier min
+        $productFournisseur = new ProductFournisseur($this->db);
+        $supplier_min_price = $productFournisseur->find_min_price_product_fournisseur($product->id);
+
+		//Accessible values by expressions
+		$extra_values = array_merge($extra_values, array(
+			"supplier_min_price" => $supplier_min_price,
+		));
+
+		//Parse the expression and return the price, if not error occurred check if price is higher than min
+		$result = $this->parseExpression($product, $expression, $extra_values);
+		if (empty($this->error)) {
+			if ($result < $product->price_min) {
+				$result = $product->price_min;
+			}
+		}
+		return $result;
+	}
+
+	/**
+	 *	Calculates product price based on product id and expression id
+	 *
+	 *	@param	Product				$product    	The Product object to get information
+	 *	@param	int 				$expression_id  The expression to parse
+	 *	@param	array 				$extra_values   Any aditional values for expression
+     *  @return int 				> 0 if OK, < 1 if KO
+	 */
+	public function parseProduct($product, $extra_values = array())
+	{
+		//Get the expression from db
+		$price_expression = new PriceExpression($this->db);
+		$res = $price_expression->fetch($product->fk_price_expression);
+		if ($res < 1) {
+			$this->error = array(19, null);
+			return -1;
+		}
+
+		//Parse the expression and return the price
+		return $this->parseProductExpression($product, $price_expression->expression, $extra_values);
+	}
+
 	/**
 	 *	Calculates supplier product price based on product id and string expression
 	 *
 	 *	@param	int					$product_id    	The Product id to get information
 	 *	@param	string 				$expression     The expression to parse
-	 *	@param	int					$quantity     	Min quantity
-	 *	@param	int					$tva_tx     	VAT rate
+	 *	@param	int					$quantity     	Supplier Min quantity
+	 *	@param	int					$tva_tx     	Supplier VAT rate
 	 *	@param	array 				$extra_values   Any aditional values for expression
      *  @return int 				> 0 if OK, < 1 if KO
 	 */
 	public function parseProductSupplierExpression($product_id, $expression, $quantity = null, $tva_tx = null, $extra_values = array())
 	{
-		//Accessible values by expressions
-		$expression_values = array(
-			"quantity" => $quantity,
-			"tva_tx" => $tva_tx,
-		);
-		$expression_values = array_merge($expression_values, $extra_values);
-
-		//Retreive all extrafield for product and add it to expression_values
-		$extrafields = new ExtraFields($this->db);
-		$extralabels = $extrafields->fetch_name_optionals_label('product', true);
+		//Get the product data
 		$product = new Product($this->db);
-		$product->fetch_optionals($product_id, $extralabels);
-		foreach($extrafields->attribute_label as $key=>$label)
-		{
-			$expression_values['options_'.$key] = $product->array_options['options_'.$key];
-		}
+		$product->fetch($product_id, '', '', 1);
 
-		//Parse the expression and return the price
-		return $this->parseExpression($expression_values, $expression);
+		//Accessible values by expressions
+		$extra_values = array_merge($extra_values, array(
+			"supplier_quantity" => $quantity,
+			"supplier_tva_tx" => $tva_tx,
+		));
+		return $this->parseExpression($product, $expression, $extra_values);
 	}
 
 	/**
@@ -227,9 +291,10 @@ class PriceParser
 	 */
 	public function parseProductSupplier($product_id, $expression_id, $quantity = null, $tva_tx = null, $extra_values = array())
 	{
+		//Get the expression from db
 		$price_expression = new PriceExpression($this->db);
 		$res = $price_expression->fetch($expression_id);
-		if ($res > 1) {
+		if ($res < 1) {
 			$this->error = array(19, null);
 			return -1;
 		}
diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index a889136de01..9331a89aa9c 100755
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -10,6 +10,7 @@
  * Copyright (C) 2011-2014	Alexandre Spangaro		<alexandre.spangaro@gmail.com>
  * Copyright (C) 2014		Henry Florian			<florian.henry@open-concept.pro>
  * Copyright (C) 2014		Philippe Grand			<philippe.grand@atoo-net.com>
+ * Copyright (C) 2014		Ion agorria			<ion@agorria.com> 
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -30,8 +31,9 @@
  *	\ingroup    produit
  *	\brief      File of class to manage predefined products or services
  */
-require_once DOL_DOCUMENT_ROOT .'/core/class/commonobject.class.php';
+require_once DOL_DOCUMENT_ROOT.'/core/class/commonobject.class.php';
 require_once DOL_DOCUMENT_ROOT.'/product/class/productbatch.class.php';
+require_once DOL_DOCUMENT_ROOT.'/product/class/priceparser.class.php';
 
 
 /**
@@ -165,6 +167,8 @@ class Product extends CommonObject
 
 	//note not visible on orders and invoices
 	var $note;
+	
+    var $fk_price_expression;
 
 	/**
 	 *  Constructor
@@ -1112,9 +1116,9 @@ class Product extends CommonObject
 
 		// Add new price
 		$sql = "INSERT INTO ".MAIN_DB_PREFIX."product_price(price_level,date_price,fk_product,fk_user_author,price,price_ttc,price_base_type,tosell,tva_tx,recuperableonly,";
-		$sql.= " localtax1_tx, localtax2_tx, price_min,price_min_ttc,price_by_qty,entity) ";
+		$sql.= " localtax1_tx, localtax2_tx, price_min,price_min_ttc,price_by_qty,entity,fk_price_expression) ";
 		$sql.= " VALUES(".($level?$level:1).", '".$this->db->idate($now)."',".$this->id.",".$user->id.",".$this->price.",".$this->price_ttc.",'".$this->price_base_type."',".$this->status.",".$this->tva_tx.",".$this->tva_npr.",";
-		$sql.= " ".$this->localtax1_tx.",".$this->localtax2_tx.",".$this->price_min.",".$this->price_min_ttc.",".$this->price_by_qty.",".$conf->entity;
+		$sql.= " ".$this->localtax1_tx.",".$this->localtax2_tx.",".$this->price_min.",".$this->price_min_ttc.",".$this->price_by_qty.",".$conf->entity.",".$this->fk_price_expression;
 		$sql.= ")";
 
 		dol_syslog(get_class($this)."_log_price", LOG_DEBUG);
@@ -1176,7 +1180,7 @@ class Product extends CommonObject
 
 		// We do select by searching with qty and prodfournprice
 		$sql = "SELECT pfp.rowid, pfp.price as price, pfp.quantity as quantity,";
-		$sql.= " pfp.fk_product, pfp.ref_fourn, pfp.fk_soc, pfp.tva_tx, pfp.fk_price_expression";
+		$sql.= " pfp.fk_product, pfp.ref_fourn, pfp.fk_soc, pfp.tva_tx, pfp.fk_supplier_price_expression";
 		$sql.= " FROM ".MAIN_DB_PREFIX."product_fournisseur_price as pfp";
 		$sql.= " WHERE pfp.rowid = ".$prodfournprice;
 		if ($qty) $sql.= " AND pfp.quantity <= ".$qty;
@@ -1188,9 +1192,9 @@ class Product extends CommonObject
 			$obj = $this->db->fetch_object($resql);
 			if ($obj && $obj->quantity > 0)		// If found
 			{
-                if (!empty($obj->fk_price_expression)) {
+                if (!empty($obj->fk_supplier_price_expression)) {
                     $priceparser = new PriceParser($this->db);
-                    $price_result = $priceparser->parseProductSupplier($obj->fk_product, $obj->fk_price_expression, $obj->quantity, $obj->tva_tx);
+                    $price_result = $priceparser->parseProductSupplier($obj->fk_product, $obj->fk_supplier_price_expression, $obj->quantity, $obj->tva_tx);
                     if ($price_result >= 0) {
                     	$obj->price = $price_result;
                     }
@@ -1206,7 +1210,7 @@ class Product extends CommonObject
 			{
 				// We do same select again but searching with qty, ref and id product
 				$sql = "SELECT pfp.rowid, pfp.price as price, pfp.quantity as quantity, pfp.fk_soc,";
-				$sql.= " pfp.fk_product, pfp.ref_fourn as ref_supplier, pfp.tva_tx, pfp.fk_price_expression";
+				$sql.= " pfp.fk_product, pfp.ref_fourn as ref_supplier, pfp.tva_tx, pfp.fk_supplier_price_expression";
 				$sql.= " FROM ".MAIN_DB_PREFIX."product_fournisseur_price as pfp";
 				$sql.= " WHERE pfp.ref_fourn = '".$fourn_ref."'";
 				$sql.= " AND pfp.fk_product = ".$product_id;
@@ -1221,9 +1225,9 @@ class Product extends CommonObject
 					$obj = $this->db->fetch_object($resql);
 					if ($obj && $obj->quantity > 0)		// If found
 					{
-		                if (!empty($obj->fk_price_expression)) {
+		                if (!empty($obj->fk_supplier_price_expression)) {
 		                    $priceparser = new PriceParser($this->db);
-		                    $price_result = $priceparser->parseProductSupplier($obj->fk_product, $obj->fk_price_expression, $obj->quantity, $obj->tva_tx);
+		                    $price_result = $priceparser->parseProductSupplier($obj->fk_product, $obj->fk_supplier_price_expression, $obj->quantity, $obj->tva_tx);
 		                    if ($result >= 0) {
 		                    	$obj->price = $price_result;
 		                    }
@@ -1281,7 +1285,7 @@ class Product extends CommonObject
 		// Clean parameters
 		if (empty($this->tva_tx))  $this->tva_tx=0;
         if (empty($newnpr)) $newnpr=0;
-
+ 
 		// Check parameters
 		if ($newvat == '') $newvat=$this->tva_tx;
 		if (! empty($newminprice) && ($newminprice > $newprice))
@@ -1397,16 +1401,50 @@ class Product extends CommonObject
 		return 1;
 	}
 
+    /**
+     *  Sets the supplier price expression
+     *
+     *  @param  int     $expression_id	Expression
+     *  @return int                 	<0 if KO, >0 if OK
+     */
+    function setPriceExpression($expression_id)
+    {
+        global $conf;
+
+        // Clean parameters
+        $this->db->begin();
+        $expression_id = $expression_id != 0 ? $expression_id : 'NULL';
+
+        $sql = "UPDATE ".MAIN_DB_PREFIX."product";
+        $sql.= " SET fk_price_expression = ".$expression_id;
+        $sql.= " WHERE rowid = ".$this->id;
+
+        dol_syslog(get_class($this)."::setPriceExpression", LOG_DEBUG);
+
+        $resql = $this->db->query($sql);
+        if ($resql)
+        {
+            $this->db->commit();
+            return 1;
+        }
+        else
+        {
+            $this->error=$this->db->error()." sql=".$sql;
+            $this->db->rollback();
+            return -1;
+        }
+    }
 
 	/**
 	 *  Load a product in memory from database
 	 *
-	 *  @param	int		$id      	Id of product/service to load
-	 *  @param  string	$ref     	Ref of product/service to load
-	 *  @param	string	$ref_ext	Ref ext of product/service to load
-	 *  @return int     			<0 if KO, 0 if not found, >0 if OK
+	 *  @param	int		$id      			Id of product/service to load
+	 *  @param  string	$ref     			Ref of product/service to load
+	 *  @param	string	$ref_ext			Ref ext of product/service to load
+     *  @param	int		$ignore_expression  Ignores the math expression for calculating price and uses the db value instead
+	 *  @return int     					<0 if KO, 0 if not found, >0 if OK
 	 */
-	function fetch($id='',$ref='',$ref_ext='')
+	function fetch($id='', $ref='', $ref_ext='', $ignore_expression = 0)
 	{
 	    include_once DOL_DOCUMENT_ROOT.'/core/lib/company.lib.php';
 
@@ -1428,7 +1466,7 @@ class Product extends CommonObject
 		$sql.= " weight, weight_units, length, length_units, surface, surface_units, volume, volume_units, barcode, fk_barcode_type, finished,";
 		$sql.= " accountancy_code_buy, accountancy_code_sell, stock, pmp,";
 		$sql.= " datec, tms, import_key, entity, desiredstock, tobatch";
-		$sql.= " ,ref_ext";
+		$sql.= " ,ref_ext, fk_price_expression";
 		$sql.= " FROM ".MAIN_DB_PREFIX."product";
 		if ($id) $sql.= " WHERE rowid = ".$this->db->escape($id);
 		else
@@ -1505,6 +1543,7 @@ class Product extends CommonObject
 				$this->entity					= $obj->entity;
 
 				$this->ref_ext					= $obj->ref_ext;
+				$this->fk_price_expression		= $obj->fk_price_expression;
 
 				$this->db->free($resql);
 
@@ -1640,6 +1679,19 @@ class Product extends CommonObject
 					}
 				}
 
+                if (!empty($this->fk_price_expression) && empty($ignore_expression)) 
+                {
+                    $priceparser = new PriceParser($this->db);
+                    $price_result = $priceparser->parseProduct($this);
+                    if ($price_result >= 0) 
+                    {
+                        $this->price = $price_result;
+                        //Calculate the VAT
+						$this->price_ttc = price2num($this->price) * (1 + ($this->tva_tx / 100));
+						$this->price_ttc = price2num($this->price_ttc,'MU');
+                    }
+                }
+
 				// We should not load stock at each fetch. If someone need stock, he must call load_stock after fetch.
 				//$res=$this->load_stock();
 
diff --git a/htdocs/product/expression.php b/htdocs/product/expression.php
index 68c57489bfb..be3e5401789 100755
--- a/htdocs/product/expression.php
+++ b/htdocs/product/expression.php
@@ -37,6 +37,7 @@ $title = GETPOST('expression_title', 'alpha');
 $expression = GETPOST('expression');
 $tab = GETPOST('tab', 'alpha');
 $tab = (!empty($tab)) ? $tab : 'card';
+$tab = strtolower($tab);
 
 // Security check
 $result=restrictedArea($user,'produit|service&fournisseur',$id,'product&product','','','rowid');
@@ -82,6 +83,7 @@ if ($action == 'add')
 				if ($result > 0) //created successfully, set the eid to newly created entry
 				{
 					$eid = $price_expression->id;
+					setEventMessage($langs->trans("RecordSaved"));
 				}
 				else
 				{
@@ -123,6 +125,10 @@ if ($action == 'update')
 				{
 					setEventMessage("update: ".$price_expression->error, 'errors');
 				}
+				else
+				{
+					setEventMessage($langs->trans("RecordSaved"));
+				}
 			}
 		}
 		else if ($result < 0)
@@ -179,7 +185,8 @@ print '<input class="flat" name="expression_title" size="15" value="'.($price_ex
 print '</td></tr>';
 
 //Price expression editor
-print '<tr><td class="fieldrequired">'.$form->textwithpicto($langs->trans("PriceExpressionEditor"),$langs->trans("PriceExpressionEditorHelp"),1).'</td><td>';
+$help_text = $langs->trans("PriceExpressionEditorHelp1").'<br><br>'.$langs->trans("PriceExpressionEditorHelp2").'<br><br>'.$langs->trans("PriceExpressionEditorHelp3").'<br><br>'.$langs->trans("PriceExpressionEditorHelp4");
+print '<tr><td class="fieldrequired">'.$form->textwithpicto($langs->trans("PriceExpressionEditor"),$help_text,1).'</td><td>';
 require_once DOL_DOCUMENT_ROOT.'/core/class/doleditor.class.php';
 $doleditor=new DolEditor('expression',isset($price_expression->expression)?$price_expression->expression:'','',300,'','',false,false,false,4,80);
 $doleditor->Create();
@@ -202,7 +209,7 @@ print '</center>';
 
 print '</form>';	
 
-// This code reloads the page depending of selected option, goes back in history when back is pressed
+// This code reloads the page depending of selected option, goes to page selected by tab when back is pressed
 print '<script type="text/javascript">
 	jQuery(document).ready(run);
 	function run() {
@@ -210,7 +217,7 @@ print '<script type="text/javascript">
 		jQuery("#expression_selection").change(on_change);
 	}
 	function on_click() {
-		window.location = "'.str_replace('expression.php', $tab.'.php', $_SERVER["PHP_SELF"]).'?id='.$id.'";
+		window.location = "'.str_replace('expression.php', $tab.'.php', $_SERVER["PHP_SELF"]).'?id='.$id.($tab == 'price' ? '&action=edit_price' : '').'";
 	}
 	function on_change() {
 		window.location = "'.$_SERVER["PHP_SELF"].'?id='.$id.'&tab='.$tab.'&eid=" + $("#expression_selection").attr("value");
diff --git a/htdocs/product/fournisseurs.php b/htdocs/product/fournisseurs.php
index 5adc79f3f65..85e323cca51 100755
--- a/htdocs/product/fournisseurs.php
+++ b/htdocs/product/fournisseurs.php
@@ -97,51 +97,52 @@ if (empty($reshook))
 		}
 	}
 
-	if ($action == 'updateprice' && GETPOST('cancel') <> $langs->trans("Cancel"))
+if ($action == 'updateprice' && GETPOST('cancel') <> $langs->trans("Cancel"))
+{
+    $id_fourn=GETPOST("id_fourn");
+    if (empty($id_fourn)) $id_fourn=GETPOST("search_id_fourn");
+    $ref_fourn=GETPOST("ref_fourn");
+    if (empty($ref_fourn)) $ref_fourn=GETPOST("search_ref_fourn");
+    $quantity=GETPOST("qty");
+	$remise_percent=price2num(GETPOST('remise_percent','alpha'));
+    $npr = preg_match('/\*/', $_POST['tva_tx']) ? 1 : 0 ;
+    $tva_tx = str_replace('*','', GETPOST('tva_tx','alpha'));
+    $tva_tx = price2num($tva_tx);
+	$price_expression = GETPOST('eid', 'int') ? GETPOST('eid', 'int') : ''; // Discard expression if not in expression mode
+
+    if ($tva_tx == '')
+    {
+		$error++;
+	    setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("VATRateForSupplierProduct")), 'errors');
+    }
+	if (empty($quantity))
 	{
-		$id_fourn=GETPOST("id_fourn");
-		if (empty($id_fourn)) $id_fourn=GETPOST("search_id_fourn");
-		$ref_fourn=GETPOST("ref_fourn");
-		if (empty($ref_fourn)) $ref_fourn=GETPOST("search_ref_fourn");
-		$quantity=GETPOST("qty");
-		$remise_percent=price2num(GETPOST('remise_percent','alpha'));
-		$npr = preg_match('/\*/', $_POST['tva_tx']) ? 1 : 0 ;
-		$tva_tx = str_replace('*','', GETPOST('tva_tx','alpha'));
-		$tva_tx = price2num($tva_tx);
-		$price_expression = GETPOST('eid', 'int') == 0 ? 'NULL' : GETPOST('eid', 'int'); //Discard expression if not in expression mode
-
-		if ($tva_tx == '')
+		$error++;
+		setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("Qty")), 'errors');
+	}
+	if (empty($ref_fourn))
+	{
+		$error++;
+		setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("RefSupplier")), 'errors');
+	}
+	if ($id_fourn <= 0)
+	{
+		$error++;
+		setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("Supplier")), 'errors');
+	}
+	if ($_POST["price"] < 0 || $_POST["price"] == '')
+	{
+		if ($price_expression === '')	// Return error of missing price only if price_expression not set
 		{
 			$error++;
-			setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("VATRateForSupplierProduct")), 'errors');
+			setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("Price")), 'errors');
 		}
-		if (empty($quantity))
+		else
 		{
-			$error++;
-			setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("Qty")), 'errors');
+			$_POST["price"] = 0;
 		}
-		if (empty($ref_fourn))
-		{
-			$error++;
-			setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("RefSupplier")), 'errors');
-		}
-		if ($id_fourn <= 0)
-		{
-			$error++;
-			setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("Supplier")), 'errors');
-		}
-		if ($_POST["price"] < 0 || $_POST["price"] == '')
-		{
-			if ($price_expression == 'NULL') { //This is not because of using expression instead of numeric price
-				$error++;
-				setEventMessage($langs->trans("ErrorFieldRequired",$langs->transnoentities("Price")), 'errors');
-			}
-			else
-			{
-				$_POST["price"] = 0;
-			}
-		}
-
+	}
+	
 		$product = new ProductFournisseur($db);
 		$result=$product->fetch($id);
 		if ($result <= 0)
@@ -189,7 +190,8 @@ if (empty($reshook))
 				}
 				else
 				{
-					if ($price_expression != 'NULL') {
+					if ($price_expression !== '') 
+					{
 						//Check the expression validity by parsing it
 						$priceparser = new PriceParser($db);
 						$price_result = $priceparser->parseProductSupplier($id, $price_expression, $quantity, $tva_tx);
@@ -402,7 +404,7 @@ if ($id || $ref)
 				print '</td></tr>';
 
 				if (! empty($conf->dynamicprices->enabled)) //Only show price mode and expression selector if module is enabled
-				{ 
+				{
 					// Price mode selector
 					print '<tr><td class="fieldrequired">'.$langs->trans("PriceMode").'</td><td>';
 					$price_expression = new PriceExpression($db);
@@ -410,7 +412,7 @@ if ($id || $ref)
 					foreach ($price_expression->list_price_expression() as $entry) {
 						$price_expression_list[$entry->id] = $entry->title;
 					}
-					$price_expression_preselection = GETPOST('eid') ? GETPOST('eid') : ($product->fk_price_expression ? $product->fk_price_expression : '0');
+					$price_expression_preselection = GETPOST('eid') ? GETPOST('eid') : ($product->fk_supplier_price_expression ? $product->fk_supplier_price_expression : '0');
 					print $form->selectarray('eid', $price_expression_list, $price_expression_preselection);
 					print '&nbsp; <div id="expression_editor" class="button">'.$langs->trans("PriceExpressionEditor").'</div>';
 					print '</td></tr>';
@@ -436,7 +438,7 @@ if ($id || $ref)
 				}
 
 				// Price qty min
-				print '<tr id="price_numeric"><td class="fieldrequired">'.$langs->trans("PriceQtyMin").'</td>';
+				print '<tr><td class="fieldrequired">'.$langs->trans("PriceQtyMin").'</td>';
 				print '<td><input class="flat" name="price" size="8" value="'.(GETPOST('price')?price(GETPOST('price')):(isset($product->fourn_price)?price($product->fourn_price):'')).'">';
 				print '&nbsp;';
 				print $form->select_PriceBaseType((GETPOST('price_base_type')?GETPOST('price_base_type'):$product->price_base_type), "price_base_type");
diff --git a/htdocs/product/index.php b/htdocs/product/index.php
old mode 100644
new mode 100755
index 820f0829b61..18827f3b9b0
--- a/htdocs/product/index.php
+++ b/htdocs/product/index.php
@@ -27,6 +27,7 @@
 require '../main.inc.php';
 require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
+require_once DOL_DOCUMENT_ROOT.'/product/class/priceparser.class.php';
 
 $type=GETPOST("type",'int');
 if ($type =='' && !$user->rights->produit->lire) $type='1';	// Force global page on service page only
@@ -232,7 +233,7 @@ print '</div><div class="fichetwothirdright"><div class="ficheaddleft">';
  * Last modified products
  */
 $max=15;
-$sql = "SELECT p.rowid, p.label, p.price, p.ref, p.fk_product_type, p.tosell, p.tobuy,";
+$sql = "SELECT p.rowid, p.label, p.price, p.ref, p.fk_product_type, p.tosell, p.tobuy, p.fk_price_expression,";
 $sql.= " p.tms as datem";
 $sql.= " FROM ".MAIN_DB_PREFIX."product as p";
 $sql.= " WHERE p.entity IN (".getEntity($product_static->element, 1).")";
@@ -298,9 +299,17 @@ if ($result)
 			// Sell price
 			if (empty($conf->global->PRODUIT_MULTIPRICES))
 			{
+                if (!empty($objp->fk_price_expression)) {
+                	$product = new Product($db);
+                	$product->fetch($objp->rowid);
+                    $priceparser = new PriceParser($db);
+                    $price_result = $priceparser->parseProduct($product);
+                    if ($price_result >= 0) {
+                        $objp->price = $price_result;
+                    }
+                }
 				print '<td align="right">';
-    			if ($objp->price_base_type == 'TTC') print price($objp->price_ttc).' '.$langs->trans("TTC");
-    			else print price($objp->price).' '.$langs->trans("HT");
+    			print price($objp->price).' '.$langs->trans("HT");
     			print '</td>';
 			}
 			print '<td align="right" class="nowrap">';
@@ -313,7 +322,7 @@ if ($result)
 			$i++;
 		}
 
-		$db->free();
+		$db->free($result);
 
 		print "</table>";
 	}
diff --git a/htdocs/product/price.php b/htdocs/product/price.php
old mode 100644
new mode 100755
index 516a4be9fbd..4c6b51ab2fb
--- a/htdocs/product/price.php
+++ b/htdocs/product/price.php
@@ -7,6 +7,7 @@
  * Copyright (C) 2014		Florian Henry			<florian.henry@open-concept.pro>
  * Copyright (C) 2014		Juanjo Menent			<jmenent@2byte.es>
  * Copyright (C) 2014 	    Philippe Grand 		    <philippe.grand@atoo-net.com>
+ * Copyright (C) 2014		Ion agorria				<ion@agorria.com> 
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -30,6 +31,8 @@
 require '../main.inc.php';
 require_once DOL_DOCUMENT_ROOT . '/core/lib/product.lib.php';
 require_once DOL_DOCUMENT_ROOT . '/product/class/product.class.php';
+require_once DOL_DOCUMENT_ROOT . '/product/class/priceexpression.class.php';
+require_once DOL_DOCUMENT_ROOT . '/product/class/priceparser.class.php';
 
 if (! empty($conf->global->PRODUIT_CUSTOMER_PRICES)) {
 	require_once DOL_DOCUMENT_ROOT . '/product/class/productcustomerprice.class.php';
@@ -72,6 +75,7 @@ if ($action == 'update_price' && ! GETPOST("cancel") && ($user->rights->produit-
 
 	$error=0;
 	$maxpricesupplier = $object->min_recommended_price();
+	$object->fk_price_expression = empty(GETPOST('eid', 'int')) ? 0 : GETPOST('eid', 'int'); //0 discards expression
 
 	// MultiPrix
 	if (! empty($conf->global->PRODUIT_MULTIPRICES))
@@ -114,9 +118,34 @@ if ($action == 'update_price' && ! GETPOST("cancel") && ($user->rights->produit-
 		$action='edit_price';
 	}
 
+	if ($newprice < $newprice_min && ! empty($object->fk_price_expression)) {
+		$newprice = $newprice_min; //Set price same as min, the user will not see the 
+	}
+
 	if ($object->updatePrice($newprice, $newpricebase, $user, $newvat, $newprice_min, $level, $newnpr, $newpsq) > 0) {
-		$action = '';
-		setEventMessage($langs->trans("RecordSaved"));
+		if ($object->fk_price_expression != 0) {
+			//Check the expression validity by parsing it
+			$priceparser = new PriceParser($db);
+			$price_result = $priceparser->parseProduct($object);
+			if ($price_result < 0) { //Expression is not valid
+				$error++;
+				$action='edit_price';
+				setEventMessage($priceparser->translatedError(), 'errors');
+			}
+		}
+		if (empty($error) && ! empty($conf->dynamicprices->enabled)) {
+			$ret=$object->setPriceExpression($object->fk_price_expression);
+			if ($ret < 0)
+			{
+				$error++;
+				$action='edit_price';
+				setEventMessage($object->error, 'errors');
+			}
+		}
+		if (empty($error)) {
+			$action = '';
+			setEventMessage($langs->trans("RecordSaved"));
+		}
 	} else {
 		$action = 'edit_price';
 		setEventMessage($object->error, 'errors');
@@ -652,16 +681,52 @@ if ($action == 'edit_price' && ($user->rights->produit->creer || $user->rights->
 		print $form->select_PriceBaseType($object->price_base_type, "price_base_type");
 		print '</td>';
 		print '</tr>';
+ 		
+ 		//Only show price mode and expression selector if module is enabled
+		if (! empty($conf->dynamicprices->enabled)) {
+			// Price mode selector
+			print '<tr><td>'.$langs->trans("PriceMode").'</td><td>';
+			$price_expression = new PriceExpression($db);
+			$price_expression_list = array(0 => $langs->trans("PriceNumeric")); //Put the numeric mode as first option
+			foreach ($price_expression->list_price_expression() as $entry) {
+				$price_expression_list[$entry->id] = $entry->title;
+			}
+			$price_expression_preselection = GETPOST('eid') ? GETPOST('eid') : ($object->fk_price_expression ? $object->fk_price_expression : '0');
+			print $form->selectarray('eid', $price_expression_list, $price_expression_preselection);
+			print '&nbsp; <div id="expression_editor" class="button">'.$langs->trans("PriceExpressionEditor").'</div>';
+			print '</td></tr>';
+			// This code hides the numeric price input if is not selected, loads the editor page if editor button is pressed
+			print '<script type="text/javascript">
+				jQuery(document).ready(run);
+				function run() {
+					jQuery("#expression_editor").click(on_click);
+					jQuery("#eid").change(on_change);
+					on_change();
+				}
+				function on_click() {
+					window.location = "'.DOL_URL_ROOT.'/product/expression.php?id='.$id.'&tab=price&eid=" + $("#eid").attr("value");
+				}
+				function on_change() {
+					if ($("#eid").attr("value") == 0) {
+						jQuery("#price_numeric").show();
+					} else {
+						jQuery("#price_numeric").hide();
+					}
+				}
+			</script>';
+		}
 
 		// Price
-		print '<tr><td width="20%">';
+		$product = new Product($db);
+		$product->fetch($id, $ref, '', 1); //Ignore the math expression when getting the price
+		print '<tr id="price_numeric"><td width="20%">';
 		$text = $langs->trans('SellingPrice');
 		print $form->textwithpicto($text, $langs->trans("PrecisionUnitIsLimitedToXDecimals", $conf->global->MAIN_MAX_DECIMALS_UNIT), 1, 1);
 		print '</td><td>';
 		if ($object->price_base_type == 'TTC') {
-			print '<input name="price" size="10" value="' . price($object->price_ttc) . '">';
+			print '<input name="price" size="10" value="' . price($product->price_ttc) . '">';
 		} else {
-			print '<input name="price" size="10" value="' . price($object->price) . '">';
+			print '<input name="price" size="10" value="' . price($product->price) . '">';
 		}
 		print '</td></tr>';
 
@@ -745,7 +810,7 @@ if ($action == 'edit_price' && ($user->rights->produit->creer || $user->rights->
 // Liste des evolutions du prix
 $sql = "SELECT p.rowid, p.price, p.price_ttc, p.price_base_type, p.tva_tx, p.recuperableonly,";
 $sql .= " p.price_level, p.price_min, p.price_min_ttc,p.price_by_qty,";
-$sql .= " p.date_price as dp, u.rowid as user_id, u.login";
+$sql .= " p.date_price as dp, p.fk_price_expression, u.rowid as user_id, u.login";
 $sql .= " FROM " . MAIN_DB_PREFIX . "product_price as p,";
 $sql .= " " . MAIN_DB_PREFIX . "user as u";
 $sql .= " WHERE fk_product = " . $object->id;
@@ -790,6 +855,9 @@ if ($result) {
 		print '<td align="right">' . $langs->trans("VAT") . '</td>';
 		print '<td align="right">' . $langs->trans("HT") . '</td>';
 		print '<td align="right">' . $langs->trans("TTC") . '</td>';
+		if (! empty($conf->dynamicprices->enabled)) {
+			print '<td align="right">' . $langs->trans("PriceExpressionSelected") . '</td>';
+		}
 		print '<td align="right">' . $langs->trans("MinPrice") . ' ' . $langs->trans("HT") . '</td>';
 		print '<td align="right">' . $langs->trans("MinPrice") . ' ' . $langs->trans("TTC") . '</td>';
 		print '<td align="right">' . $langs->trans("ChangedBy") . '</td>';
@@ -819,8 +887,25 @@ if ($result) {
 
 			print '<td align="center">' . $langs->trans($objp->price_base_type) . "</td>";
 			print '<td align="right">' . vatrate($objp->tva_tx, true, $objp->recuperableonly) . "</td>";
-			print '<td align="right">' . price($objp->price) . "</td>";
-			print '<td align="right">' . price($objp->price_ttc) . "</td>";
+
+			//Price
+			if (! empty($objp->fk_price_expression) && ! empty($conf->dynamicprices->enabled))
+			{
+				$price_expression = new PriceExpression($db);
+				$res = $price_expression->fetch($objp->fk_price_expression);
+				$title = $price_expression->title;
+				print '<td align="right"></td>';
+				print '<td align="right"></td>';
+				print '<td align="right">' . $title . "</td>";
+			}
+			else
+			{
+				print '<td align="right">' . price($objp->price) . "</td>";
+				print '<td align="right">' . price($objp->price_ttc) . "</td>";
+				if (! empty($conf->dynamicprices->enabled)) { //Only if module is enabled
+					print '<td align="right"></td>';
+				}
+			}
 			print '<td align="right">' . price($objp->price_min) . '</td>';
 			print '<td align="right">' . price($objp->price_min_ttc) . '</td>';