Assigning of Questionnaires in SAP PPM 6.1 does not work

Hello,

I have a problem in SAP PPM 6.1 with assigning a questiuonare to a bucket.

I can select and assign questionaires to a bucket. But after saving the changes with success and reopen the bucket all changes are lost and the list of assigned questionnaires is empty.

I have checked the authorizations, but there was no error.

After reopening:

Has anybody an idea where the problem is caused?

Thanks in advance

Bernhard