Don't blindly trust WCF logging

I have been looking into WCF message logs to reverse engineer an existing BizTalk service and was wondering why there are extra Action and To tags in the envelope's header. If I copy and paste the exact envelope from WCF logs into SoapUI my server never gets the message; however, if I remove the and tags then it works. It looks like WCF logger injects these extra headers and if you use Fiddler or just WCF Trace logging, you won't see those!

Yaron Naveh's Web Services 2.0 Blog: Don't blindly trust WCF logging