FM to read proxy xml data

Hi All,
Is there any FM or class-method to read XML proxy message for a given message id?
Scenario: An inbound interface coming from XI to ECC system using ABAP proxy method.While processing this inbound proxy it will trigger create another response outbound proxy message - where this should read inbound message and map few data back in outbound.
Question is -
How to read XML proxy message using message id? I would like to read this inbound proxy message data to map them back to outbound interface.
Hope am clear - let me know if you need further details.
Thanks
Manohar

Not very clear for me, but maybe it's because I don't know XI. I don't understand because in ABAP, the term "proxy" is an image of a web service, this image is created in the system from where we want to access the web service.
You use proxy and message terms too many times, I don't see where is what, where is the inbound, where is the outbound. What is a "message id" for you? (XI notion?)

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