/**
  * check whether status (for all relevant users) exists
  * 
  * @param array $a_obj_ids
  * @param array $a_users
  */
 protected static function refreshObjectsStatus(array $a_obj_ids, $a_users = null)
 {
     include_once "./Services/Tracking/classes/class.ilLPStatus.php";
     foreach ($a_obj_ids as $obj_id) {
         ilLPStatus::checkStatusForObject($obj_id, $a_users);
     }
 }