I try to change the Name of the Supporter in a newly created ticket using the button next to the field. It offers me the possibility to choose a different user. But after pressing the OK-button, I get the error: "Notes error - field content can't be changed" (German: Notes-Fehler - Feldinhalt kann nicht geändert werden).

Notes-Debugger shows, that the button code tries to change the "supporter" field, which is "computed when composed" and it tries it via the uidoc.

This must fail. Any idea?