When running SUM update or a "System Copy > Target System > High-Availability System > Based on AS ABAP > Database Instance" you face the error
Server principal 'login_name' has granted one or more permission(s). Revoke the permission(s) before dropping the server principal.
15173 Server principal permission(s) revoke , KBA , BC-DB-MSS-INS , SQL Server Installation for SAP NetWeaver Products , Problem
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