I am into HL7 parser development and still learning HL7. Read articles regarding Orders but still not clear about how to identify the HL7 order request corresponding to HL7 order response message.
Additional Info: About 'MessageControlId' in MSH segment: The receiving system echoes 'MessageControlId'(10th field of MSH segment) back to the sending system in the Message acknowledgment segment(MSA). By using this ID we can identify the ACK corresponding to the request. Need to confirm whether response message will also contain this message id.
It would be greatly appreciated if someone could provide some sample ORM and corresponding ORR messages.
The ORM message type was deprecated in version 2.4 and withdrawn in 2.7 so you really shouldn't be using it at all any more. But if you do decide to use it, the matching ORM and ORR messages should have the same value in the ORC-2 (placer order number) field. Note that for a single real world order there may be multiple ORM and ORR messages.