A straightforward question I believe.
I have several backend SAP Systems but they do not have same IDs i.e. no CUA. They are set up as SAPLOGONTICKET with admin, user for user mapping.....the Green Tick indicating "ready for user mapping' appears in the alias page but the systems do not appear in the user mapping page.
HOWEVER, if I assign a reference system, the reference system appears.
Looks like you cannot user map to SAP systems without a reference system.
Or am I missing something?