Confirm message in work center is not working

Hi experts,

we upgraded our solman system to solman 7.1 sps8.

In incident management work center we have the problem that when a user confirms a message, the system responds an error message:

There are no dumps in ST22, no entries in SM21 not even in the corresponding work process trace file...

When I try to confirm the message via tcode CRMD_ORDER there are no problems.

Any ideas?

Regards, RP