/** * Retrieve store id from item * * @param Mage_Sales_Model_Order_Invoice_Item|Mage_Sales_Model_Order_Creditmemo_Item $item * @return int */ protected function _retrieveStoreIdFromItem($item) { $storeId = null; if ($item instanceof Mage_Sales_Model_Order_Invoice_Item) { $storeId = $item->getInvoice()->getStoreId(); } else { $storeId = $item->getCreditmemo()->getStoreId(); } return $storeId; }