A user-ID seems to get updated by function AD_RESET_USR02, for instance when the user gets locked or the password gets updated.
It is not clear, what AD_RESET_USR02 is/does.
SAP ABAP systems
ST03N STAD , KBA , BC-SEC-LGN , Authentication and SSO , BC-SEC-USR-ADM , Users and Authorization administration , How To
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