Help calling a web service

This is probably a dumb question but:

I’m trying to call a third party web service from BizTalk 2006. The service returns book title information and has a signature:

GetTitle(TitleId As String, ByRef ErrText As string ) as TitleInfo

The web service works fine when tested directly from a VB.net assembly.

Unfortunately the service does not expose schema types.

I have created:

– a schema project that imports the web reference.

This gives me a GetTitle_request and a GetTitle_response Multi-Part message type.

– a second project containing a bare bones orchestration to test this.

The orchestration includes:

– A TitleRequest_Message to instance the GetTitle_request.

– a message constructor to construct a TitleRequest_Message.

– a Message Assigment to set the TitleId element (hard coded to \”10\”)

– a send process

– a port bound directly to the web service using SOAP transport to the correct URI

– a receive process bound to the Response

– a send process to dump the response to file.

As a new user, I would expect that to be enough to create a valid SOAP request to call the GetTitle method. But the packet sent to the web service is a bare bones XML packet consisting of only an XML header followed by the literal text <string>10</string>. No SOAP method or TitleId element. What am I missing?

Many Thanks

Brian