zmacedoni

It is a bug in file Core/Business/Stock/Core_Business_Stock_StockManager.php at line 126 you should have like this: $stockAvailable->quantity = $stockAvailable->quantity + $delta_quantity; $stockAvailable->id_product = (int)$product->id; $stockAvailable->id_product_attribute = (int)$id_product_attribute; $stockAvailable->update();