Register contents when Exit 49 passes control back to JES2

Upon return from this exit, the register contents must be:

A return code of:

0: Tells JES2 that if additional exit routines are associated with the exit, call the next consecutive exit routine. If no other exit routines are associated with this exit, continue with normal processing.
4: Tells JES2 that even if additional exit routines are associated with the exit, ignore them; continue with normal processing. Set bit X049SKIP in the response byte to cause JES2 to select another job.