protected function _createCriteria(\App_ListFilter_Interface $filter, \App_ListFilter $filterList)
 {
     switch ($filter->getFieldName()) {
         case SimFilterFields::ALARM_TYPE:
         case SimFilterFields::ALARM_SEVERITY:
         case SimFilterFields::ALARM_ATTENDED:
             if ($this->_isAlarmFilterMapped) {
                 return;
             }
             break;
     }
     return parent::_createCriteria($filter, $filterList);
 }