diff --git a/htdocs/admin/stock.php b/htdocs/admin/stock.php
index 4e9957fe48d..d0554f2d3c8 100644
--- a/htdocs/admin/stock.php
+++ b/htdocs/admin/stock.php
@@ -49,6 +49,10 @@ if($action)
 	{
 		$res = dolibarr_set_const($db, "STOCK_USERSTOCK_AUTOCREATE", GETPOST('STOCK_USERSTOCK_AUTOCREATE','alpha'),'chaine',0,'',$conf->entity);
 	}
+	if ($action == 'STOCK_ALLOW_NEGATIVE_TRANSFER')
+	{
+		$res = dolibarr_set_const($db, "STOCK_ALLOW_NEGATIVE_TRANSFER", GETPOST('STOCK_ALLOW_NEGATIVE_TRANSFER','alpha'),'chaine',0,'',$conf->entity);
+	}
 	// Mode of stock decrease
 	if ($action == 'STOCK_CALCULATE_ON_BILL'
 	|| $action == 'STOCK_CALCULATE_ON_VALIDATE_ORDER'
@@ -427,6 +431,22 @@ print '<input type="submit" class="button" value="'.$langs->trans("Modify").'">'
 print '</form>';
 print "</td>\n";
 print "</tr>\n";
+
+$var=!$var;
+
+print "<tr ".$bc[$var].">";
+print '<td width="60%">'.$langs->trans("WarehouseAllowNegativeTransfer").'</td>';
+
+print '<td width="160" align="right">';
+print "<form method=\"post\" action=\"stock.php\">";
+print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
+print "<input type=\"hidden\" name=\"action\" value=\"STOCK_ALLOW_NEGATIVE_TRANSFER\">";
+print $form->selectyesno("STOCK_ALLOW_NEGATIVE_TRANSFER",$conf->global->STOCK_ALLOW_NEGATIVE_TRANSFER,1);
+print '<input type="submit" class="button" value="'.$langs->trans("Modify").'">';
+print '</form>';
+print "</td>\n";
+print "</tr>\n";
+
 print '<br>';
 
 /* I keep the option/feature, but hidden to end users for the moment. If feature is used by module, no need to have users see it.
diff --git a/htdocs/core/modules/modStock.class.php b/htdocs/core/modules/modStock.class.php
index 7bdf5d1d641..bc3ba80903d 100644
--- a/htdocs/core/modules/modStock.class.php
+++ b/htdocs/core/modules/modStock.class.php
@@ -71,7 +71,9 @@ class modStock extends DolibarrModules
 		$this->langfiles = array("stocks");
 
 		// Constants
-		$this->const = array();
+		$this->const = array(
+			0=>array('STOCK_ALLOW_NEGATIVE_TRANSFER','chaine','1','',1)
+		);
 
 		// Boxes
 		$this->boxes = array();
diff --git a/htdocs/langs/en_US/stocks.lang b/htdocs/langs/en_US/stocks.lang
index c1ba6f73159..dc3dfa4fb96 100644
--- a/htdocs/langs/en_US/stocks.lang
+++ b/htdocs/langs/en_US/stocks.lang
@@ -133,6 +133,8 @@ StockMustBeEnoughForShipment= Stock level must be enough to add product/service
 MovementLabel=Label of movement
 InventoryCode=Movement or inventory code
 IsInPackage=Contained into package
+WarehouseAllowNegativeTransfer=Allow transfer even without stock
+qtyToTranferIsNotEnough=You don't have enough stock from your source warehouse 
 ShowWarehouse=Show warehouse
 MovementCorrectStock=Stock correction for product %s
 MovementTransferStock=Stock transfer of product %s into another warehouse
diff --git a/htdocs/product/stock/product.php b/htdocs/product/stock/product.php
index 56504432840..4c92c353027 100644
--- a/htdocs/product/stock/product.php
+++ b/htdocs/product/stock/product.php
@@ -232,96 +232,117 @@ if ($action == "transfert_stock" && ! $cancel)
 			if (isset($object->pmp)) $pricesrc=$object->pmp;
 			$pricedest=$pricesrc;
 
-			if ($object->hasbatch())
+			$do_tranfer = true;
+			if (empty($conf->global->STOCK_ALLOW_NEGATIVE_TRANSFER))
 			{
-				$pdluo = new Productbatch($db);
-
-				if ($pdluoid > 0)
+				$fk_warehouse_source = GETPOST("id_entrepot");
+				$nb_unit = GETPOST("nbpiece",'int');
+				
+				if (empty($object->stock_warehouse[$fk_warehouse_source]->real) || $object->stock_warehouse[$fk_warehouse_source]->real < $nb_unit) 
 				{
-					$result=$pdluo->fetch($pdluoid);
-					if ($result)
+					$do_tranfer = false;
+					$result1 = $result2 = -1;
+					$action='';
+					$object->error = $langs->trans('qtyToTranferIsNotEnough');
+				}
+			}
+			
+			if ($do_tranfer)
+			{
+
+				if ($object->hasbatch())
+				{
+					$pdluo = new Productbatch($db);
+
+					if ($pdluoid > 0)
 					{
-						$srcwarehouseid=$pdluo->warehouseid;
-						$batch=$pdluo->batch;
-						$eatby=$pdluo->eatby;
-						$sellby=$pdluo->sellby;
+						$result=$pdluo->fetch($pdluoid);
+						if ($result)
+						{
+							$srcwarehouseid=$pdluo->warehouseid;
+							$batch=$pdluo->batch;
+							$eatby=$pdluo->eatby;
+							$sellby=$pdluo->sellby;
+						}
+						else
+						{
+							setEventMessages($pdluo->error, $pdluo->errors, 'errors');
+							$error++;
+						}
 					}
 					else
 					{
-						setEventMessages($pdluo->error, $pdluo->errors, 'errors');
-						$error++;
+						$srcwarehouseid=GETPOST('id_entrepot','int');
+						$batch=GETPOST('batch_number');
+						$eatby=$d_eatby;
+						$sellby=$d_sellby;
+					}
+
+					if (! $error)
+					{
+						// Remove stock
+						$result1=$object->correct_stock_batch(
+							$user,
+							$srcwarehouseid,
+							GETPOST("nbpiece",'int'),
+							1,
+							GETPOST("label",'san_alpha'),
+							$pricesrc,
+							$eatby,$sellby,$batch,
+							GETPOST('inventorycode')
+						);
+						if ($result1 < 0) $error++;
+					}
+					if (! $error)
+					{
+						// Add stock
+						$result2=$object->correct_stock_batch(
+							$user,
+							GETPOST("id_entrepot_destination",'int'),
+							GETPOST("nbpiece",'int'),
+							0,
+							GETPOST("label",'san_alpha'),
+							$pricedest,
+							$eatby,$sellby,$batch,
+							GETPOST('inventorycode')
+						);
+						if ($result2 < 0) $error++;
 					}
 				}
 				else
 				{
-					$srcwarehouseid=GETPOST('id_entrepot','int');
-					$batch=GETPOST('batch_number');
-					$eatby=$d_eatby;
-					$sellby=$d_sellby;
+					if (! $error)
+					{
+	    			    // Remove stock
+	    				$result1=$object->correct_stock(
+	    					$user,
+	    					GETPOST("id_entrepot"),
+	    					GETPOST("nbpiece"),
+	    					1,
+	    					GETPOST("label"),
+	    					$pricesrc,
+	    					GETPOST('inventorycode')
+	    				);
+	    				if ($result1 < 0) $error++;
+					}
+					if (! $error)
+					{
+	    				// Add stock
+	    				$result2=$object->correct_stock(
+	    					$user,
+	    					GETPOST("id_entrepot_destination"),
+	    					GETPOST("nbpiece"),
+	    					0,
+	    					GETPOST("label"),
+	    					$pricedest,
+	    					GETPOST('inventorycode')
+	    				);
+	    				if ($result2 < 0) $error++;
+					}
 				}
 
-				if (! $error)
-				{
-					// Remove stock
-					$result1=$object->correct_stock_batch(
-						$user,
-						$srcwarehouseid,
-						GETPOST("nbpiece",'int'),
-						1,
-						GETPOST("label",'san_alpha'),
-						$pricesrc,
-						$eatby,$sellby,$batch,
-						GETPOST('inventorycode')
-					);
-					if ($result1 < 0) $error++;
-				}
-				if (! $error)
-				{
-					// Add stock
-					$result2=$object->correct_stock_batch(
-						$user,
-						GETPOST("id_entrepot_destination",'int'),
-						GETPOST("nbpiece",'int'),
-						0,
-						GETPOST("label",'san_alpha'),
-						$pricedest,
-						$eatby,$sellby,$batch,
-						GETPOST('inventorycode')
-					);
-					if ($result2 < 0) $error++;
-				}
-			}
-			else
-			{
-				if (! $error)
-				{
-    			    // Remove stock
-    				$result1=$object->correct_stock(
-    					$user,
-    					GETPOST("id_entrepot"),
-    					GETPOST("nbpiece"),
-    					1,
-    					GETPOST("label"),
-    					$pricesrc,
-    					GETPOST('inventorycode')
-    				);
-    				if ($result1 < 0) $error++;
-				}
-				if (! $error)
-				{
-    				// Add stock
-    				$result2=$object->correct_stock(
-    					$user,
-    					GETPOST("id_entrepot_destination"),
-    					GETPOST("nbpiece"),
-    					0,
-    					GETPOST("label"),
-    					$pricedest,
-    					GETPOST('inventorycode')
-    				);
-    				if ($result2 < 0) $error++;
-				}
 			}
+
 			if (! $error && $result1 >= 0 && $result2 >= 0)
 			{
 				$db->commit();