/**
  * Retrieve object using using composite pkey values.
  * @param string $app_uid
  * @param string $una_uid
  * @param      Connection $con
  * @return     ListUnassigned
  */
 public static function retrieveByPK($app_uid, $una_uid, $con = null)
 {
     if ($con === null) {
         $con = Propel::getConnection(self::DATABASE_NAME);
     }
     $criteria = new Criteria();
     $criteria->add(ListUnassignedPeer::APP_UID, $app_uid);
     $criteria->add(ListUnassignedPeer::UNA_UID, $una_uid);
     $v = ListUnassignedPeer::doSelect($criteria, $con);
     return !empty($v) ? $v[0] : null;
 }