Using the IDIXFXIT user exit
If access was not granted via the IDIHIST_GROUP_DSN.group.hist-dsn or IDIHIST_USERID_DSN.userid.hist-dsn XFACILIT profiles, the optional IDIXFXIT user exit is called. If the IDIXFXIT exit is available, then it might ultimately grant the fault entry access. This approach might be useful if an installation has previously employed a different access authorization scheme and wants to continue using this instead of, or in conjunction with, the XFACILIT profiles.
The IDIXFXIT user exit must reside in an APF-authorized library and be available as a load module in LINKLIST with the name IDIXFXIT. It is loaded using the Language Environment® CEELOAD service, and if LE conforming, should not contain a C or PL/I main() function. The IDIXFXIT user exit must be link-edited with the NORENT option.