I've just posted to the Commerce team blog on how to use Fiddler to capture SOAP packets that are sent between CS2007 business user applications and Web services - a very handy troubleshooting technique. http://blogs.msdn.com/commerce/archive/2006/12/03/using-fiddler-to-capture-soap-messages-between-the-cs2007-web-services-and-clients.aspx
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