diff --git a/htdocs/langs/en_US/suppliers.lang b/htdocs/langs/en_US/suppliers.lang
index 7aecbdddbd2..f9df7d76b23 100644
--- a/htdocs/langs/en_US/suppliers.lang
+++ b/htdocs/langs/en_US/suppliers.lang
@@ -13,4 +13,5 @@ OrderDate=Order date
 BuyingPrice=Buying price
 AddSupplierPrice=Add supplier price
 ChangeSupplierPrice=Change supplier price
-ErrorQtyTooLowForThisSupplier=Quantity too low for this supplier
\ No newline at end of file
+ErrorQtyTooLowForThisSupplier=Quantity too low for this supplier
+ProductHasAlreadyReferenceInThisSupplier=This product has already a reference in this supplier
\ No newline at end of file
diff --git a/htdocs/langs/fr_FR/suppliers.lang b/htdocs/langs/fr_FR/suppliers.lang
index 3c7eb0a0a61..3234d96c402 100644
--- a/htdocs/langs/fr_FR/suppliers.lang
+++ b/htdocs/langs/fr_FR/suppliers.lang
@@ -13,4 +13,5 @@ OrderDate=Date commande
 BuyingPrice=Prix d'achat
 AddSupplierPrice=Ajouter prix fournisseur
 ChangeSupplierPrice=Modifier prix fournisseur
-ErrorQtyTooLowForThisSupplier=Quantité insuffisante pour ce fournisseur
\ No newline at end of file
+ErrorQtyTooLowForThisSupplier=Quantité insuffisante pour ce fournisseur
+ProductHasAlreadyReferenceInThisSupplier=Ce produit a déjà une référence chez ce fournisseur
\ No newline at end of file
diff --git a/htdocs/product.class.php b/htdocs/product.class.php
index a3cc1095932..37de0243aba 100644
--- a/htdocs/product.class.php
+++ b/htdocs/product.class.php
@@ -1354,7 +1354,7 @@ class Product
         $sql = "SELECT count(*) as nb";
         $sql.= " FROM ".MAIN_DB_PREFIX."product_fournisseur";
         $sql.= " WHERE fk_product = ".$this->id." AND fk_soc = ".$id_fourn;
-        $sql.= " AND ref_fourn = '".$ref_fourn."'";
+        //$sql.= " AND ref_fourn = '".$ref_fourn."'"; // crée des doublons
     
         $resql=$this->db->query($sql);
         if ($resql)
diff --git a/htdocs/product/fournisseurs.php b/htdocs/product/fournisseurs.php
index 4756c2d61dc..c5eae6a71b3 100644
--- a/htdocs/product/fournisseurs.php
+++ b/htdocs/product/fournisseurs.php
@@ -110,6 +110,10 @@ if ($_POST["action"] == 'updateprice' && $_POST["cancel"] <> $langs->trans("Canc
             if ($ret < 0) {
                 $error++;
                 $mesg='<div class="error">'.$product->error.'</div>';
+                if ($ret == -2)
+                {
+                	$mesg='<div class="error">'.$langs->trans("ProductHasAlreadyReferenceInThisSupplier").'</div>';
+                }
             }
         }