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How to identify an HL7 order request message (ORM) corresponding to a response message (ORR)

I am developing the HL7 parser and still studying HL7. Read the articles on Orders, but it is still unclear how to identify an HL7 order request corresponding to an HL7 request response message.

Additional Information: About the "MessageControlId" in the MSH segment: the receiving system intercepts the "MessageControlId" (10th field of the MSH segment ) back to the sending system in the message acknowledgment segment ( MSA ). Using this identifier, we can identify the ACK matching the request. You must confirm whether the response message will also contain this message identifier.

It would be very helpful if someone could provide ORM samples and corresponding ORR messages.

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ORM 2.4 2.7, . , ORM- ORR- ORC-2 ( ). , ORM ORR.

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Source: https://habr.com/ru/post/1620287/

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