How to handle multiple types in response message in Sync interfaces

Dear all,
I have the following case. A synchronous scenario that the response can be one of two possible external XSDs.
(i.e. one request that the response is eithe a succes message or error message). Both success or error response are external defintions (xsd). What is the best way to handle such a case? Do we need to have a BPM to process the request and how? My understanding is that multi-mapping and enhanced Interface determination only works for asynch interface, right? Any help will be appreciated.
S.Socratous

Yes I have thought of that but the two responses are from external xsd definitions with different namespaces and therefore I can not create such a datatype. As I mention above the web service gets a request and then has two possible replies (the two different xsd). Thanks.

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sanjuv wrote:
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How to handle multiple types in response message in Sync interfaces

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