In the Portal, access the data source configuration page. A similar error is displayed: "The reference system "JMSCLNT100" does not exist (any more). To prevent problems with ticket-based SSO to other systems, select a valid system or "No reference system" on the User Mapping tab.
SAP NetWeaver Release Independent
KBA , BC-JAS-SEC-UME , User Management Engine , BC-JAS-SEC , Security, User Management , Problem
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