While using the Web Service Software Factory Modelling Edition to build up some WCF-Services I stumbled across a little Bug which was hard to find in the first place. While I was using the Host-Explorer to create my TestClient Proxies I noticed that some Endpoints led to creating wrong proxies where i.e. all Guids had been replaced by strings and many other stuff. Even with the Visual Studio Proxy generator some strange stuff occured such as generating classes like DoSomethingRequest1 which contained only one property of the Type DoSomethingRequest - so it seemed a bit of doublewrapped..
Finally I figured out what led to such behaviours: if you're designing a ServiceContract and putting more than one Message Part into a message you will get an Error saying that you have to set the "Is Wrapped"-Property of the message to True. This seems to be not a problem as long as the Request the message belongs to does not have another message associated (i.e. Request and Response) which has its "Is wrapped"-Property to False because it may have less than two Parts. Only if message is "wrapped" and one is not this problem occures so don't trap into that one