function setSchedulePolicyID($id)
 {
     $id = trim($id);
     if ($id == '' or empty($id)) {
         $id = NULL;
     }
     $splf = new SchedulePolicyListFactory();
     if ($id == NULL or $this->Validator->isResultSetWithRows('schedule_policy', $splf->getByID($id), TTi18n::gettext('Schedule Policy is invalid'))) {
         $this->data['schedule_policy_id'] = $id;
         return TRUE;
     }
     return FALSE;
 }