A job is receiving a TSS7221E DATASET NOT ACCESSIBLE for a master catalog dataset. Even though the message is issued the job still completes.
The job is trying to access a dataset that is catalogued in the catalog reported in the message, for example:
DSN=CATALOG.MASTER.TSPT.VSCTT01
Permit READ access to the catalog dataset reported:
TSS PERMIT(acid) DSN(CATALOG.MASTER.TSPT.VSCTT01) ACCESS(READ)