LDAP Error by creating OX Mail Fetchmail entry

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Hello,
after the last univention server update, it impossible to create a new fetchmail entry in the OX Mail app.
I always get this error message:
Das LDAP-Objekt konnte nicht gespeichert werden: LDAP-Fehler Object class violation: object class 'oxFetchmailSingleDrop' requires attribute 'localRecipient'

The last one I create was about 14 days ago without any problem, so I wonder what happened between.
Which log should I check or what can I do to solve this problem?

Thank you!

[Wolfgang Rosenauer]

This probably needs to go to the Univention forum. Fetchmail is not part of the OX software.