When you implement unique ID assignment using the BPX.UNIQUE.USER profile, RACF® updates the OMVS segments of user and group profiles. If your installation synchronizes profiles in the USER and GROUP classes, you should enable automatic direction of application updates for these classes.

SET AUTOAPPL
RDEFINE RRSFDATA AUTODIRECT.*.USER.APPL UACC(READ)
RDEFINE RRSFDATA AUTODIRECT.*.GROUP.APPL UACC(READ)

If you use &RACUID in the home directory string when you define the OMVS segment of the model user ID, and this update gets propagated to a system earlier than z/OS® V2R1 that does not have APAR OA42554 installed, substitution of user IDs for &RACUID does not occur when new OMVS segments are assigned on that system. For information about using &RACUID in the home directory string, see Steps for automatically assigning unique IDs through UNIX services.