public function setProductsQuantity(&$objFormParam)
    {
        $arrShipmentsItems = $objFormParam->getSwapArray(array('shipment_product_class_id','shipment_quantity'));

        // 配送先が存在する時のみ、商品個数の再設定を行います
        if(!SC_Utils_Ex::isBlank($arrShipmentsItems)) {
            foreach ($arrShipmentsItems as $arritems) {
                foreach ($arritems['shipment_product_class_id'] as $relation_index => $shipment_product_class_id) {
                    $arrUpdateQuantity[$shipment_product_class_id] += $arritems['shipment_quantity'][$relation_index];
                }
            }

            $arrProductsClass = $objFormParam->getValue('product_class_id');
/* changed
            $arrProductsQuantity = $objFormParam->getValue('quantity');
changed */
            $arrQuantity['quantity'] = $objFormParam->getValue('quantity');
/* changed */
            foreach ($arrProductsClass as $relation_key => $product_class_id) {
// added
if ($arrUpdateQuantity[$product_class_id]) {
// added
                $arrQuantity['quantity'][$relation_key] = $arrUpdateQuantity[$product_class_id];
// added
}
// added
            }
            $objFormParam->setParam($arrQuantity);
        }
    }