Register contents when Exit 48 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 this exit, call the next consecutive exit routine. If no other exit routines are associated with this exit, continue with normal processing, which is determined by the particular exit point from which the exit routine was called.
4: Tells JES2 that even if additional exit routines are associated with this exit, ignore them; continue with normal processing, which is determined by the particular exit point from which the exit routine was called.