Evaluate your environment's security policies carefully, and then either
assign unique UIDs and GIDs to all users and groups
or
set up the default OMVS segments, as follows:
Define a Group ID (GID) to the system to be used as an anchor for a default OMVS group segment with the following RACF command:
ADDGROUP OEDFLTG OMVS(GID(777777))
Define a user ID (UID) to be used as an anchor for the default OMVS user segment by using the following RACF command:
ADDUSER OEDFLTU DFLTGRP(OEDFLTG) NAME('OE DEFAULT USER') OMVS(UID(999999)
HOME('/') PROGRAM('/bin/echo'))
Set up a default for the USER OMVS segment only (that is, create a facility class profile named BPX.DEFAULT.USER and then specify the default UID in the application data field, by using the following RACF commands:
RDEFINE FACILITY BPX.DEFAULT.USER APPLDATA('OEDFLTU')
SETROPTS RACLIST(FACILITY) REFRESH