Message Number list used by SAP ABAP Program RSUSR300 (Set External Security Name for All Users)
SAP ABAP Program RSUSR300 (Set External Security Name for All Users) is using
# Object Type Object Name Object Description Note
     
1 Message Number  01 - 323 Changes not allowed in this system (central user administration active)
2 Message Number  S# - 511 No users found in the selected area