protected function getPositions($quoterequestid)
 {
     $positionsDb = new Purchases_Model_DbTable_Quoterequestpos();
     $positions = $positionsDb->fetchAll($positionsDb->select()->where('quoterequestid = ?', $quoterequestid)->where('clientid = ?', $this->_user['clientid'])->order('ordering'));
     return $positions;
 }