private static function loadRootOrgRefIdAndId()
 {
     if (self::$root_ref_id === Null || self::$root_id === null) {
         global $ilDB;
         $q = "SELECT o.obj_id, r.ref_id FROM object_data o\n\t\t\tINNER JOIN object_reference r ON r.obj_id = o.obj_id\n\t\t\tWHERE title = " . $ilDB->quote('__OrgUnitAdministration', 'text') . "";
         $set = $ilDB->query($q);
         $res = $ilDB->fetchAssoc($set);
         self::$root_id = $res["obj_id"];
         self::$root_ref_id = $res["ref_id"];
     }
 }