Restrictions

MVS™ macros are unavailable to programs running in cross memory mode unless the macro documentation specifically states that it is available.
Code running in cross memory mode cannot issue an SVC except ABEND. That is, any macro that depends on an SVC is unavailable in cross memory mode.
Only one step of a job can establish ownership of space switch entry tables. Subsequent job steps cannot issue the LXRES, AXRES, or ETCRE macros.
Routines that get control as the result of a PC instruction must not use the checkpoint/restart facility.
In order to be accessed, the address space must be one or more of the following:
- The home address space
- A non-swappable address space
- An address space whose local lock is held or whose local lock is held as a cross memory local (CML) lock.