Requirements for VSAM RLS request execution mode

When a program makes a request while a data set is open in RLS mode (OPEN, CLOSE, or record management request), the program must be running in the following execution mode, with the listed constraints:

Task mode (not SUB mode)
Address space control=primary
Home address space=primary address space=secondary address space
No functional recovery routine (FRR) is in effect, but an ESTAE routine might be in effect.

The VSAM RLS record management request task must be the same task that opened the ACB, or the task that opened the access method control block (ACB) must be in the task hierarchy.