Inviter's can't change inviters end date

[phavekes]

If an inviter is also the guest of a role (guest role included), the UI offers to change his own role's end-date. But this is not allowed. The ui does not provide feedback on the failing API call (HTTP403), and the server logs:

Sep 8 13:29:18 XXXXXXXXXXXXXXXXXXX.surfconext.nl inviteserver[761]: 2026-09-08 13:29:18,650 ERROR [http-nio-8080-exec-5] invite.api.DefaultErrorController:72 - Error occurred; invite.exception.UserRestrictionException: Invalid invation by XXXXXXXXXXX@XXXXX.nl for roles XXXXXXXXXXXXXXXXXX

• For inviters: Do not show the option to change the enddate of a role if the user is also an inviter
• Inform the user if changing the enddate of a role returns an error. Generate a reference code, log it and show it to the user

[oharsta]

@phavekes Can't reproduce on test2. Already fixed?