/**
* Delete a value within an order
*
* @param int orderId
* @param int productId
*/
public static function deleteOrderValue($orderId, $productId)
{
$db = FrontendModel::getContainer()->get('database');
// update record
$db->delete('catalog_orders_values', 'order_id = ? AND product_id = ?', array((int) $orderId, (int) $productId));
// invalidate the cache for catalog
FrontendModel::invalidateFrontendCache('catalog', FL::getWorkingLanguage());
}