product_price в Virtuemart1.1.2. - [VM1] Общие вопросы и ошибки

$itog = $product_price * $koeficient;

$db->query( "SELECT product_price FROM #__{vm}_product_price WHERE product_id='$product_id'");
$product_price = $db->f('product_price');

			// Get default price
			$q = "SELECT product_price, product_price_id, product_currency FROM #__{vm}_product_price WHERE product_id='$product_id' AND ";
			$q .= "shopper_group_id='$default_shopper_group_id' $volume_quantity_sql";
			$db->setQuery($q); $db->query();
			if ($db->next_record()) {
				$price_info["product_price"]=$db->f("product_price") * ((100 - $shopper_group_discount)/100);
				if( $check_multiple_prices ) {
					$price_info["product_base_price"]= $price_info["product_price"];
					$price_info["product_has_multiple_prices"] = $db->num_rows() > 1;
				}
				$price_info["product_price_id"]=$db->f("product_price_id");
				$price_info["product_currency"] = $db->f("product_currency");
				$price_info["item"] = true;
				$GLOBALS['product_info'][$product_id]['price'] = $price_info;
				return $GLOBALS['product_info'][$product_id]['price'];
			}