Deluge: Getting an Requester/User additional field and populate an UDF-field in a request/incident

Deluge: Getting an Requester/User additional field and populate an UDF-field in a request/incident

On Ticket creation I want to run a business rule to get the data from a Requester/User Additional field "Ort" (Location) and populate the UDF-field Campus.
When I dump a request to json there is no data under the requester for these additional fields. So how do I access them?

This is the code I have now:

  2. returnjson = Map();
  3. Ort = requestObj.get(context).get("userinfo").get("Ort");
  4. requestObj.get(context).get(;
  5. returnjson = {
  6.   "operation": [{
  7.     "INPUT_DATA": [{ "request": 
  8. { 
  9. "udf_fields": { "udf_field_api_name": {
  10.           "udf_pick_4501": Ort
  11.         }
  12.       }
  13.   }
  14.     }],
  15.     "OPERATIONNAME": "UPDATE",
  16.     "FORMAT": "V3"
  17.   }],
  18.   "result": "success",
  19.   "message": "Request had Campus updated to" + Ort
  20. };
  21. return returnjson;