public function repperApiStapVijf($relationID)
 {
     // Wijzig eigenschap 'Facebook App' van relatie naar 'Facebook'
     $client = new \SoapClient('https://api.repper.nl/soap/1.1/repperservice.svc', array('soap_version' => SOAP_1_2));
     $actionHeader[] = new \SoapHeader('http://www.w3.org/2005/08/addressing', 'Action', 'http://api.repper.nl/soap/1.1/editRelationCustomField');
     $actionHeader[] = new \SoapHeader('http://www.w3.org/2005/08/addressing', 'To', 'https://api.repper.nl/soap/1.1/RepperService.svc', 1);
     $client->__setSoapHeaders($actionHeader);
     $apikey = '1a4d8cadcee34acb88c5ff7c68d11a65';
     $relationID = $relationID;
     $fieldID = 7572;
     // Eigen eigenschap met ID 7572 wijzigen
     $value = 'Facebook';
     $client->EditRelationCustomField(array('apikey' => $apikey, 'relationID' => $relationID, 'fieldID' => $fieldID, 'value' => $value));
 }