WSE Adapter null methodname

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I am trying to use the WSE adapter to consume a web service from an
Orchestration.

The Web Service, has two methods, the first uses a simple type for both the
request and response. This is working fine.

The second method takes a strongly typed XML Document as its input parameter
and also returns an instance of the same document type.

When trying to access this method, BTS is giving me an eventlog entry as set
out below. However the context proerties show the correct operation name and
the document being passed to the adapter seems to be well formed.

Has anyone seen this or know of the resolution?

Thanks


Failed to transmit message. Exception : System.ArgumentNullException: Value
cannot be null.
Parameter name: methodname
at
Microsoft.Web.Services2.Messaging.SoapClient.SendRequestResponse(String
methodname, SoapEnvelope envelope)
at
Microsoft.BizTalk.Adapter.WseTransmitter.WseTransmitter.SendRequest(RequestObject requestObject)
at
Microsoft.BizTalk.Adapter.WseTransmitter.WseTransmitter.ProcessMessage(RequestObject request)

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