In addition to the above.
BPXBATCH is a little different then the other utilities when or if the ALTID is used.
This section outlines the ALTID and USS files:
Data Set Security - CA Endevor® SCM - 18.0 - CA Technologies Documentation
This is the chart that tells most of the story if ALTID is selected by default.
BPXBATCH parameter | _BPX_BATCH_SPAWN | _BPX_SHAREAS | Security context |
SH | ANY | ANY | Alternate ID |
PGM | NO | n/a | Alternate ID |
PGM | YES | NO | Alternate ID |
PGM | YES | YES | User ID |
Other factors can come into play if ALTID is used. You can also over ride the ALTID settings above with the ALTID keyword.