public function getIssueVoucherItemsAction()
 {
     $voucher = $this->_request->getParam('voucher');
     $wh_id = $this->_request->getParam('wh_id');
     if (!empty($voucher)) {
         $pipeline_consignments = new Model_PipelineConsignments();
         $result = $pipeline_consignments->getIssueVoucherItemsList($voucher, $wh_id);
     } else {
         $result = array("error" => "Please provide transaction number. e.g. (?voucher=12)");
     }
     echo Zend_Json::encode($result);
 }