You have Solution manager 7.1 that is using CUA that operated in other system. e.g. ERP system. If the server running CUA service is unavailable you can see that all users were deleted.
Solution Manager 7.1
CUA, Central, User, Administration, deletes, deleted, empty. , KBA , SV-SMG-ADM-CNM , Central Notification Management , SV-SMG-INS-CFG , Setup and Configuration of the Solution Manager system , Problem
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