CASCS1002E Receive allocate for trans-id, communications error comms-primary-RC.

Inbound allocate for transaction trans-id failed because of a communications error. trans-id is the primary return code of the communications layer.
System Action:
The receive allocate is not issued and will time out based external communications parameters.
Resolution:
The most likely cause of this error is a definition error for the invocable transaction program.
Module:
dfhebms (issued in dfheserv)
Destination:
TDQ CSMT.