/**
  * Run extra validation for the fields being edited.
  */
 protected function validate()
 {
     parent::validate();
     if ($this->post_exists('position_option') && $this->post('position_option') == 'create' && $this->new_position instanceof iHRIS_Position) {
         $this->new_position->validate();
     }
     if ($this->isPost() && $this->old_position instanceof iHRIS_Position) {
         if ($this->getPrimary()->start_date->compare($this->old_person_position->start_date) != -1) {
             $this->getPrimary()->setInvalidMessage('start_date', 'bad_date');
         }
         if (!$this->old_position->getField('status')->isValid()) {
             $this->old_position->setInvalidMessage('status', 'required');
         }
         //I2CE::raiseMessage("in validate " . $this->old_position->getField('status')->getDBValue() );
         if (!$this->old_person_position->getField('reason')->isValid()) {
             $this->old_person_position->setInvalidMessage('reason', 'required');
         }
     }
 }