XCF does not allow multiple work units to be blocked for receiving the same message. XCF permits only one receive to be active at a time. If two work units invoke IXCRECV RECEIVE=RESPONSES for the same completed message at the same time (the work units will not be blocked since the message has completed), only one of them receives the response data, the status metadata, or both. The request from the other work unit is to be rejected.