Problem ins Scenario RFC = XI = HTTP

Hi everybody!
I have a scenario in which an R/3 Backend queries an external System using XI. The communication path is:
ABAP Program (sync. RFC) <=> XI <=> (plain HTTP / XML) external System
Unfortunately so far the call only works one way - the RFC call is routed to the XI system which in turn calls the external system. I see the call in the external system's log files. But somehow the answer of the external system is lost.
I also have problems debugging this scenario, since I don't find any messages in transaction SXMB_MONI. I don't know if the two problems are related, but right now I'm really confused.
Any suggestions or hints?
Regards, Joerg

Hi all,
Solved the problem myself. However the problem is so curious, that I post the answer here - maybe someone else with the same problem will find it.
The answer of the external system is transformed using an XSL stylesheet. The stylesheet generated the following RFC-XML message:
<rfc:Z_xxx
xmlns:rfc="urn:sap-com:document:sap:rfc:functions" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

</rfc:Z_xxx>
As soon as I removed the superfluous Namespace daclaration xmlns:xsi - which wasn't even used in the resulting XML document - everything worked fine. Personally I find this a bit strange, but who cares
Regards, Joerg

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