public function delete()
{
$db = JFactory::getDBO();
$query = "DELETE FROM " . $db->quoteName('#__jeproshop_tax_rule') . " WHERE " . $db->quoteName('tax_rules_group_id') . " = " . $this->tax_rules_group_id;
$db->setQuery($query);
$res = $db->query();
return parent::deleste() && $res;
}