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