diff --git a/htdocs/commande/commande.class.php b/htdocs/commande/commande.class.php
index 13fd0727a72..a0876250a77 100644
--- a/htdocs/commande/commande.class.php
+++ b/htdocs/commande/commande.class.php
@@ -502,12 +502,15 @@ class Commande extends CommonObject
 	}
 
 	/**
-	 *  \brief		Create order
-	 *  \param		user 	Objet utilisateur qui cree
+	 *  	\brief		Create order
+	 *		\param		user 	Objet user that make creation
+	 * 		\return 	int		<0 if KO, >0 if OK
+	 *		\remarks	this->ref can be set or empty. If empty, we will use "(PROV)"
 	 */
 	function create($user)
 	{
 		global $conf,$langs,$mysoc;
+		$error=0;
 
 		// Clean parameters
 		$this->brouillon = 1;		// On positionne en mode brouillon la commande
@@ -515,11 +518,13 @@ class Commande extends CommonObject
 		dol_syslog("Commande::create user=".$user->id);
 
 		// Check parameters
-		if (empty($this->ref))
-	 	{
-			$this->error=$langs->trans("ErrorFieldRequired",$langs->trans("Ref"));
+		$soc = new Societe($this->db);
+		$result=$soc->fetch($this->socid);
+		if ($result < 0)
+		{
+			$this->error="Failed to fetch company";
 			dol_syslog("Commande::create ".$this->error, LOG_ERR);
-			return -1;
+			return -2;
 		}
 		if (! empty($conf->global->COMMANDE_REQUIRE_SOURCE) && $this->source < 0)
 		{
@@ -530,14 +535,6 @@ class Commande extends CommonObject
 		if (! $remise) $remise=0;
 		if (! $this->projetid) $this->projetid = 0;
 
-		$soc = new Societe($this->db);
-		$result=$soc->fetch($this->socid);
-		if ($result < 0)
-		{
-			$this->error="Failed to fetch company";
-			dol_syslog("Commande::create ".$this->error, LOG_ERR);
-			return -2;
-		}
 
 		$this->db->begin();
 
diff --git a/htdocs/facture.class.php b/htdocs/facture.class.php
index 641442eb48b..4b048bc0c53 100644
--- a/htdocs/facture.class.php
+++ b/htdocs/facture.class.php
@@ -130,11 +130,13 @@ class Facture extends CommonObject
 	 *	\brief     	Create invoice in database
 	 *	\param     	user       		Object user that create
 	 *	\param      notrigger		1 ne declenche pas les triggers, 0 sinon
-	 *	\return		int				<0 si ko, >0 si ok
+	 *	\return		int				<0 if KO, >0 if OK
+	 *	\remarks	this->ref can be set or empty. If empty, we will use "(PROV)"
 	 */
 	function create($user,$notrigger=0)
 	{
 		global $langs,$conf,$mysoc;
+		$error=0;
 
 		// Clean parameters
 		if (! $this->type) $this->type = 0;
@@ -148,21 +150,15 @@ class Facture extends CommonObject
 		dol_syslog("Facture::Create user=".$user->id);
 
 		// Check parameters
-		// TODO suppression de cette verification a confirmer
-		// la ref est toujours vide puisque c'est une création
-		/*
-		if (empty($this->ref))
-	 	{
-			$this->error=$langs->trans("ErrorFieldRequired",$langs->trans("Ref"));
-			dol_syslog("Facture::create ".$this->error, LOG_ERR);
-			return -1;
-		}
-		*/
-
 		$soc = new Societe($this->db);
-		$soc->fetch($this->socid);
+		$result=$soc->fetch($this->socid);
+		if ($result < 0)
+		{
+			$this->error="Failed to fetch company";
+			dol_syslog("Facture::create ".$this->error, LOG_ERR);
+			return -2;
+		}
 
-		$error=0;
 
 		$this->db->begin();
 
diff --git a/htdocs/propal.class.php b/htdocs/propal.class.php
index 22b25557a43..8fc94994195 100644
--- a/htdocs/propal.class.php
+++ b/htdocs/propal.class.php
@@ -512,27 +512,32 @@ class Propal extends CommonObject
 	/**
 	 *      \brief      Create commercial proposal
 	 * 		\param		user	User that create
-	 *      \return     int     <0 si ko, >=0 si ok
+	 *      \return     int     <0 if KO, >=0 if OK
+	 * 		\remarks	this->ref can be set or empty. If empty, we will use "(PROV)"
 	 */
 	function create($user='')
 	{
 		global $langs,$conf,$mysoc;
+		$error=0;
 
 		// Clean parameters
 		$this->fin_validite = $this->datep + ($this->duree_validite * 24 * 3600);
-		
+
 		dol_syslog("Propal::Create");
-		
+
 		// Check parameters
-		if (empty($this->ref))
-	 	{
-			$this->error=$langs->trans("ErrorFieldRequired",$langs->trans("Ref"));
-			dol_syslog("Facture::create ".$this->error, LOG_ERR);
-			return -1;
-		}	
 		$soc = new Societe($this->db);
-		$soc->fetch($this->socid);
-		$this->verifyNumRef($soc);	// Check ref is not yet used
+		$result=$soc->fetch($this->socid);
+		if ($result < 0)
+		{
+			$this->error="Failed to fetch company";
+			dol_syslog("Propal::create ".$this->error, LOG_ERR);
+			return -2;
+		}
+		if (! empty($this->ref))
+		{
+			$this->verifyNumRef($soc);	// Check ref is not yet used
+		}
 
 
 		$this->db->begin();
@@ -1972,7 +1977,7 @@ class Propal extends CommonObject
 	}
 
 	/**
-	 *      \brief      Verifie si la ref n'est pas deja utilisee
+	 *      \brief      Check if ref is used. And if used tkae next one.
 	 *      \param	    soc  		            objet societe
 	 */
 	function verifyNumRef($soc)