public function markNotDuplicateWithMetaData(EventModel $notDuplicateEvent, EventEditMetaDataModel $eventEditMetaDataModel)
 {
     global $DB;
     $notDuplicateEvent->setIsDuplicateOfId(null);
     $this->eventDBAccess->update($notDuplicateEvent, array('is_duplicate_of_id'), $eventEditMetaDataModel);
 }