PL/I considerations

PL/I routines that are the target of (call_main) or (call_sub) must be Enterprise PL/I for z/OS or PL/I for MVS & VM routines. OS PL/I Version 1 and OS PL/I Version 2 routines can run in the preinitialized environment only when called from PL/I routines that are the target of (call_main) or (call_sub).