diff --git a/htdocs/comm/propal/class/api_proposals.class.php b/htdocs/comm/propal/class/api_proposals.class.php
index f719dbf7ea8..2c3afba030f 100644
--- a/htdocs/comm/propal/class/api_proposals.class.php
+++ b/htdocs/comm/propal/class/api_proposals.class.php
@@ -280,14 +280,14 @@ class Proposals extends DolibarrApi
                         $request_data->date_end,
                         $request_data->array_options,
                         $request_data->fk_unit,
-                        $this->element,
-                        $request_data->id,
+                        $request_data->origin,
+                        $request_data->origin_id,
                         $request_data->multicurrency_subprice,
                         $request_data->fk_remise_except
       );
 
       if ($updateRes > 0) {
-        return $this->get($id)->line->rowid;
+        return $updateRes;
 
       }
       return false;
diff --git a/htdocs/comm/propal/class/propal.class.php b/htdocs/comm/propal/class/propal.class.php
index a2af740793e..e7eeaab0c7e 100644
--- a/htdocs/comm/propal/class/propal.class.php
+++ b/htdocs/comm/propal/class/propal.class.php
@@ -590,6 +590,11 @@ class Propal extends CommonObject
                 return -2;
             }
         }
+		else
+		{
+			dol_syslog(get_class($this)."::addline status of order must be Draft to allow use of ->addline()", LOG_ERR);
+			return -3;
+		}
     }
 
 
diff --git a/htdocs/commande/class/api_orders.class.php b/htdocs/commande/class/api_orders.class.php
index d4b4502d4ed..9acfd6cc245 100644
--- a/htdocs/commande/class/api_orders.class.php
+++ b/htdocs/commande/class/api_orders.class.php
@@ -52,9 +52,9 @@ class Orders extends DolibarrApi
     }
 
     /**
-     * Get properties of a commande object
+     * Get properties of an order object
      *
-     * Return an array with commande informations
+     * Return an array with order informations
      *
      * @param       int         $id         ID of order
      * @return 	array|mixed data without useless information
@@ -176,7 +176,7 @@ class Orders extends DolibarrApi
      * Create order object
      *
      * @param   array   $request_data   Request data
-     * @return  int     ID of commande
+     * @return  int     ID of order
      */
     function post($request_data = NULL)
     {
@@ -236,8 +236,8 @@ class Orders extends DolibarrApi
     /**
      * Add a line to given order
      *
-     * @param int   $id             Id of commande to update
-     * @param array $request_data   Orderline data
+     * @param int   $id             Id of order to update
+     * @param array $request_data   OrderLine data
      *
      * @url	POST {id}/lines
      *
@@ -281,12 +281,13 @@ class Orders extends DolibarrApi
                         $request_data->label,
                         $request_data->array_options,
                         $request_data->fk_unit,
-                        $this->element,
-                        $request_data->id
+                        $request_data->origin,
+                        $request_data->origin_id,
+                        $request_data->multicurrency_subprice
       );
 
       if ($updateRes > 0) {
-        return $this->get($id)->line->rowid;
+        return $updateRes;
 
       }
       return false;
@@ -295,9 +296,9 @@ class Orders extends DolibarrApi
     /**
      * Update a line to given order
      *
-     * @param int   $id             Id of commande to update
+     * @param int   $id             Id of order to update
      * @param int   $lineid         Id of line to update
-     * @param array $request_data   Orderline data
+     * @param array $request_data   OrderLine data
      *
      * @url	PUT {id}/lines/{lineid}
      *
@@ -310,7 +311,7 @@ class Orders extends DolibarrApi
 
       $result = $this->commande->fetch($id);
       if( ! $result ) {
-         throw new RestException(404, 'Commande not found');
+         throw new RestException(404, 'Order not found');
       }
 
 		  if( ! DolibarrApi::_checkAccessToResource('commande',$this->commande->id)) {
@@ -338,7 +339,8 @@ class Orders extends DolibarrApi
                         $request_data->label,
                         $request_data->special_code,
                         $request_data->array_options,
-                        $request_data->fk_unit
+                        $request_data->fk_unit,
+      					$request_data->multicurrency_subprice
       );
 
       if ($updateRes > 0) {
@@ -353,7 +355,7 @@ class Orders extends DolibarrApi
      * Delete a line to given order
      *
      *
-     * @param int   $id             Id of commande to update
+     * @param int   $id             Id of order to update
      * @param int   $lineid         Id of line to delete
      *
      * @url	DELETE {id}/lines/{lineid}
diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 9ed198eefa3..1eec56fdbab 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -1431,10 +1431,10 @@ class Commande extends CommonOrder
                 return -2;
             }
         }
-        else
-        {
+		else
+		{
             dol_syslog(get_class($this)."::addline status of order must be Draft to allow use of ->addline()", LOG_ERR);
-            return -3;
+			return -3;
         }
     }
 
diff --git a/htdocs/compta/facture/class/api_invoices.class.php b/htdocs/compta/facture/class/api_invoices.class.php
index f841fc80050..c5c14da9a8f 100644
--- a/htdocs/compta/facture/class/api_invoices.class.php
+++ b/htdocs/compta/facture/class/api_invoices.class.php
@@ -210,6 +210,190 @@ class Invoices extends DolibarrApi
         return $this->invoice->id;
     }
 
+    /**
+     * Get lines of an invoice
+     *
+     * @param int   $id             Id of invoice
+     *
+     * @url	GET {id}/lines
+     *
+     * @return int
+     */
+    function getLines($id) {
+    	if(! DolibarrApiAccess::$user->rights->facture->lire) {
+    		throw new RestException(401);
+    	}
+
+    	$result = $this->invoice->fetch($id);
+    	if( ! $result ) {
+    		throw new RestException(404, 'Invoice not found');
+    	}
+
+    	if( ! DolibarrApi::_checkAccessToResource('facture',$this->invoice->id)) {
+    		throw new RestException(401, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
+    	}
+    	$this->invoice->getLinesArray();
+    	$result = array();
+    	foreach ($this->invoice->lines as $line) {
+    		array_push($result,$this->_cleanObjectDatas($line));
+    	}
+    	return $result;
+    }
+
+    /**
+     * Add a line to given order
+     *
+     * @param int   $id             Id of invoice to update
+     * @param array $request_data   Orderline data
+     *
+     * @url	POST {id}/lines
+     *
+     * @return int
+     */
+    function postLine($id, $request_data = NULL) {
+    	if(! DolibarrApiAccess::$user->rights->facture->creer) {
+    		throw new RestException(401);
+    	}
+
+    	$result = $this->invoice->fetch($id);
+    	if( ! $result ) {
+    		throw new RestException(404, 'Invoice not found');
+    	}
+
+    	if( ! DolibarrApi::_checkAccessToResource('facture',$this->invoice->id)) {
+    		throw new RestException(401, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
+    	}
+    	$request_data = (object) $request_data;
+    	$updateRes = $this->invoice->addline(
+    		$request_data->desc,
+    		$request_data->subprice,
+    		$request_data->qty,
+    		$request_data->tva_tx,
+    		$request_data->localtax1_tx,
+    		$request_data->localtax2_tx,
+    		$request_data->fk_product,
+    		$request_data->remise_percent,
+    		$request_data->date_start,
+    		$request_data->date_end,
+    		0,
+    		$request_data->info_bits,
+    		$request_data->fk_remise_except,
+    		'HT',
+    		0,
+    		$request_data->product_type,
+    		$request_data->rang,
+    		$request_data->special_code,
+    		$request_data->origin,
+    		$request_data->origin_id,
+    		$fk_parent_line,
+    		$request_data->fk_fournprice,
+    		$request_data->pa_ht,
+    		$request_data->label,
+    		$request_data->array_options,
+    		$request_data->situation_percent,
+    		$request_data->prev_id,
+    		$request_data->fk_unit,
+    		$request_data->multicurrency_subprice
+    		);
+
+    	if ($updateRes > 0) {
+    		return $updateRes;
+
+    	}
+    	return false;
+    }
+
+    /**
+     * Update a line to given order
+     *
+     * @param int   $id             Id of invoice to update
+     * @param int   $lineid         Id of line to update
+     * @param array $request_data   InvoiceLine data
+     *
+     * @url	PUT {id}/lines/{lineid}
+     *
+     * @return object
+     */
+    function putLine($id, $lineid, $request_data = NULL) {
+    	if(! DolibarrApiAccess::$user->rights->facture->creer) {
+    		throw new RestException(401);
+    	}
+
+    	$result = $this->invoice->fetch($id);
+    	if( ! $result ) {
+    		throw new RestException(404, 'Invoice not found');
+    	}
+
+    	if( ! DolibarrApi::_checkAccessToResource('facture',$this->invoice->id)) {
+    		throw new RestException(401, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
+    	}
+    	$request_data = (object) $request_data;
+    	$updateRes = $this->invoice->updateline(
+    		$lineid,
+    		$request_data->desc,
+    		$request_data->subprice,
+    		$request_data->qty,
+    		$request_data->remise_percent,
+    		$request_data->date_start,
+    		$request_data->date_end,
+    		$request_data->tva_tx,
+    		$request_data->localtax1_tx,
+    		$request_data->localtax2_tx,
+    		'HT',
+    		$request_data->info_bits,
+    		$request_data->product_type,
+    		$request_data->fk_parent_line,
+    		0,
+    		$request_data->fk_fournprice,
+    		$request_data->pa_ht,
+    		$request_data->label,
+    		$request_data->special_code,
+    		$request_data->array_options,
+    		$request_data->situation_percent,
+    		$request_data->fk_unit,
+    		$request_data->multicurrency_subprice
+    		);
+
+    	if ($updateRes > 0) {
+    		$result = $this->get($id);
+    		unset($result->line);
+    		return $this->_cleanObjectDatas($result);
+    	}
+    	return false;
+    }
+
+    /**
+     * Delete a line to given order
+     *
+     *
+     * @param int   $id             Id of invoice to update
+     * @param int   $lineid         Id of line to delete
+     *
+     * @url	DELETE {id}/lines/{lineid}
+     *
+     * @return int
+     */
+    function delLine($id, $lineid) {
+    	if(! DolibarrApiAccess::$user->rights->facture->creer) {
+    		throw new RestException(401);
+    	}
+
+    	$result = $this->invoice->fetch($id);
+    	if( ! $result ) {
+    		throw new RestException(404, 'Invoice not found');
+    	}
+
+    	if( ! DolibarrApi::_checkAccessToResource('facture',$this->invoice->id)) {
+    		throw new RestException(401, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
+    	}
+    	$request_data = (object) $request_data;
+    	$updateRes = $this->invoice->deleteline($lineid);
+    	if ($updateRes > 0) {
+    		return $this->get($id);
+    	}
+    	return false;
+    }
+
     /**
      * Update invoice
      *
diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index fc019d92eea..37f5166bc53 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -2638,6 +2638,11 @@ class Facture extends CommonInvoice
 				return -2;
 			}
 		}
+		else
+		{
+			dol_syslog(get_class($this)."::addline status of order must be Draft to allow use of ->addline()", LOG_ERR);
+			return -3;
+		}
 	}
 
 	/**