IXCMSGC can be used to discard an incomplete message-out request before the message completes, thus having the effect of cancelling the message-out request. For a broadcast message to multiple targets, any remaining messages will not be sent. The system discards any responses that have been collected for the cancelled message as well as any responses that subsequently arrive for the cancelled message.

It might be necessary to cancel a message-out request to recover from a situation in which a target member (who has not failed nor left the group) fails to send the necessary response. XCF does not expect a response from a member who has terminated or left the group.