public function getToLocations($_whlocation_id = '', $_whaction_id = '')
 {
     // used by ajax to get a list of locations for a given WH Action and From Location
     if (isset($this->_data['ajax'])) {
         if (!empty($this->_data['whlocation_id'])) {
             $_whlocation_id = $this->_data['whlocation_id'];
         }
         if (!empty($this->_data['whaction_id'])) {
             $_whaction_id = $this->_data['whaction_id'];
         }
     }
     $transfer_rule = new WHTransferrule();
     $locations = $transfer_rule->getToLocations($_whaction_id, $_whlocation_id);
     if (isset($this->_data['ajax'])) {
         $this->view->set('options', $locations);
         $this->setTemplateName('select_options');
     } else {
         return $locations;
     }
 }