Returning a Response from a Business Process that is not the same Message Type Request

I thought I knew how to return a Response from a Business Process back to the Source Config Name, but I guess not. 

I am working on a Proof of Concept, that the Request Message Class would determine a "Route" within a Business Process to make a FHIR call (search, read) to our External FHIR repository, and return back the HS.FHIR.DTL.vR4.Model.Resource.xxxxxxx as a Response to the Source Config Name.

I have the FHIR part working, however now that I have the data in the form of HS.FHIR.DTL.vR4.Model.Resource.xxxxxxx, I am struggling to understand how I could send it back to the Original Source Config. In theory this sounds ok but when I get to the Management Portal build, I am struggling...

Do I send the FHIR Response to a EnsLib.Msg.RuleEngine? If so, how do I make sure the Request Source Config Name gets forwarded on so the Rules Engine knows where to send the message?

Any Ideas on how I can make this happen?