protected function getNonExistentAbsenceTypeId()
 {
     $c = new Criteria();
     $c->addSelectColumn(AbsenceTypePeer::ID);
     $stmt = AbsenceTypePeer::doSelectStmt($c);
     $ids = $stmt->fetchAll(PDO::FETCH_COLUMN, 0);
     sort($ids);
     return array_pop($ids) + 1;
 }