Ack format

We are sending ADT messages to a foreign system.  The Ack’s coming back from the destintion system don’t seem to have any unique msg id’s.  How does cloverleaf know the acknowledgment received was for the current message sent and not a message previously sent?  Based on the validate_hl7ack proc it doesn’t do any checking.  Is there a way to tell cloverleaf to enforce message acknowledgement validation?