SAP Message SMOBREPMAIN027 - Cannot change repository &1 (not member of standard replication group)

Diagnosis
You tried to enable Client Upgrade for repository &V2&. Currentlyanother repository has this property.
Since this is only allowed for one repository only, the otherrepository hast to be changed as well. However, it is not member ofthe standard replication group and can thus not be maintained usingthis transaction.

System Response
No changes happen.

Procedure
Please contact SAP via OSS.