Error when changing calender permissions on a exchange federation trust


I have a federation trust between two Exchange 2010 SP2 organisations. Everything works fine except when i want to change the level between two federated persons.

If i change the level via Outlook then a message appears (printscreen):
- the modivied permission cannot be saved (and)
- and error occured when Setting schedule permissions

If i try the same via Outlook works. I tried it with Outlook 2010 and Outlook is the same Problem.

any hints?

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ITSGMBHConnect With a Mentor Author Commented:
no solution found so far..i close the case.
ITSGMBHAuthor Commented:
no solution found
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