$exp='(Obargain.id = '.$this->params['bargain_id'].' and Obargain.father_id = 0) or (Obargain.father_id = '.$this->params['bargain_id'].' and Obargain.father_id > 0)';
$exp='(Obargain.id = '.$this->params['bargain_id'].' and Obargain.father_id = 0) or (Obargain.father_id = '.$this->params['bargain_id'].' and Obargain.father_id > 0)';