diff --git a/htdocs/admin/stock.php b/htdocs/admin/stock.php
index 87ed5fe64c6..d0a859e1987 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'
 	|| $action == 'STOCK_CALCULATE_ON_VALIDATE_ORDER'
@@ -367,6 +371,22 @@ print '<input type="submit" class="button" value="'.$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>';
 print '</table>';
 print '<br>';
diff --git a/htdocs/core/modules/modStock.class.php b/htdocs/core/modules/modStock.class.php
index 8f6840a21b0..5ac13df8ecc 100644
--- a/htdocs/core/modules/modStock.class.php
+++ b/htdocs/core/modules/modStock.class.php
@@ -70,7 +70,9 @@ 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
 		$this->boxes = array();
diff --git a/htdocs/langs/en_US/stocks.lang b/htdocs/langs/en_US/stocks.lang
index fdd6408accb..fb2a034b9f6 100644
--- a/htdocs/langs/en_US/stocks.lang
+++ b/htdocs/langs/en_US/stocks.lang
@@ -123,3 +123,5 @@ StockMustBeEnoughForInvoice=Stock level must be enough to add product/service in
 StockMustBeEnoughForOrder=Stock level must be enough to add product/service into order
 StockMustBeEnoughForShipment= Stock level must be enough to add product/service into shipment
 WarehouseMustBeSelectedAtFirstStepWhenProductBatchModuleOn=Source warehouse must be defined here when batch module is on. It will be used to list wich lot/serial is available for product that required lot/serial data for movement. If you want to send products from different warehouses, just make the shipment into several steps.
+WarehouseAllowNegativeTransfer=Allow transfer even without stock
+qtyToTranferIsNotEnough=You don't have enough stock from your source warehouse 
\ No newline at end of file
diff --git a/htdocs/product/stock/product.php b/htdocs/product/stock/product.php
index 83ad3088a11..c9ba20e95f5 100644
--- a/htdocs/product/stock/product.php
+++ b/htdocs/product/stock/product.php
@@ -204,59 +204,80 @@ if ($action == "transfert_stock" && ! $cancel)
 
 				//print 'price src='.$pricesrc.', price dest='.$pricedest;exit;
 
-							$pdluoid=GETPOST('pdluoid','int');
-
-				if ($pdluoid>0)
+				$do_tranfer = true;
+					
+				if (empty($conf->global->STOCK_ALLOW_NEGATIVE_TRANSFER))
 				{
-				    $pdluo = new Productbatch($db);
-				    $result=$pdluo->fetch($pdluoid);
-
-				    if ($result>0 && $pdluo->id)
-				    {
-                        // Remove stock
-                        $result1=$product->correct_stock_batch(
-				            $user,
-				            $pdluo->warehouseid,
-				            GETPOST("nbpiece",'int'),
-				            1,
-				            GETPOST("label",'san_alpha'),
-				            $pricesrc,
-				            $pdluo->eatby,$pdluo->sellby,$pdluo->batch
-				        );
-                        // Add stock
-                        $result2=$product->correct_stock_batch(
-                            $user,
-                            GETPOST("id_entrepot_destination",'int'),
-                            GETPOST("nbpiece",'int'),
-                            0,
-                            GETPOST("label",'san_alpha'),
-                            $pricedest,
-                            $pdluo->eatby,$pdluo->sellby,$pdluo->batch
-                        );
-				    }
+					$fk_warehouse_source = GETPOST("id_entrepot_source");
+					$nb_unit = GETPOST("nbpiece",'int');
+					
+					if (empty($product->stock_warehouse[$fk_warehouse_source]->real) || $product->stock_warehouse[$fk_warehouse_source]->real < $nb_unit) 
+					{
+						$do_tranfer = false;
+						$result1 = $result2 = -1;
+						$action='';
+						$product->error = $langs->trans('qtyToTranferIsNotEnough');
+					}
 				}
-				else
+				
+				if ($do_tranfer)
 				{
-                    // Remove stock
-                    $result1=$product->correct_stock(
-                        $user,
-                        GETPOST("id_entrepot_source"),
-                        GETPOST("nbpiece"),
-                        1,
-                        GETPOST("label"),
-                        $pricesrc
-                    );
+					$pdluoid=GETPOST('pdluoid','int');
 
-                    // Add stock
-                    $result2=$product->correct_stock(
-                        $user,
-                        GETPOST("id_entrepot_destination"),
-                        GETPOST("nbpiece"),
-                        0,
-                        GETPOST("label"),
-                        $pricedest
-                    );
+					if ($pdluoid>0)
+					{
+					    $pdluo = new Productbatch($db);
+					    $result=$pdluo->fetch($pdluoid);
+	
+					    if ($result>0 && $pdluo->id)
+					    {
+	                        // Remove stock
+	                        $result1=$product->correct_stock_batch(
+					            $user,
+					            $pdluo->warehouseid,
+					            GETPOST("nbpiece",'int'),
+					            1,
+					            GETPOST("label",'san_alpha'),
+					            $pricesrc,
+					            $pdluo->eatby,$pdluo->sellby,$pdluo->batch
+					        );
+	                        // Add stock
+	                        $result2=$product->correct_stock_batch(
+	                            $user,
+	                            GETPOST("id_entrepot_destination",'int'),
+	                            GETPOST("nbpiece",'int'),
+	                            0,
+	                            GETPOST("label",'san_alpha'),
+	                            $pricedest,
+	                            $pdluo->eatby,$pdluo->sellby,$pdluo->batch
+	                        );
+					    }
+					}
+					else
+					{
+	                    // Remove stock
+	                    $result1=$product->correct_stock(
+	                        $user,
+	                        GETPOST("id_entrepot_source"),
+	                        GETPOST("nbpiece"),
+	                        1,
+	                        GETPOST("label"),
+	                        $pricesrc
+	                    );
+	
+	                    // Add stock
+	                    $result2=$product->correct_stock(
+	                        $user,
+	                        GETPOST("id_entrepot_destination"),
+	                        GETPOST("nbpiece"),
+	                        0,
+	                        GETPOST("label"),
+	                        $pricedest
+	                    );
+					}
+						
 				}
+				
 				if ($result1 >= 0 && $result2 >= 0)
 				{
 					$db->commit();