CASST0011W Error allocating shared memory for shutdown transaction

An attempt to shutdown a region externally via a transid was rejected as the transaction could not be scheduled due to an error allocating shared memory.
Restriction: This topic applies only when the Enterprise Server feature is enabled.
System Action:
The region will not be shutdown.
Resolution:
If there is no shared memory available try to shutdown the region without a transid.
Module:
dfhgrtrm
Destination:
Console