WCF Unhandled FaultException was not handled by usercode

i'm trying to use a WCF Plain service with Telerik OpenAccess in VS 2012 with .net 4.5. I tried the telerik developers manual and created the service and a client. In the service interface IEntitiesModel I put ``` [OperationContract] [FaultContract(typeof(string))] PersistentDto ReadPersistentDto(string dtoKey); ``` In the EntitiesModel.SVC for the method I used an easy construct as first try: ``` public PersistentDto ReadPersistentDto(string dtoKey) { throw new FaultException("test"); } ``` In user code of Consumer i put a catch for the exception. Now the problem is: Every time the service is called, Visual Studio stops in "throw new FaultException" with the error message, that FaultException was not handled by usercode. If i continue with F5, the exception is also caught by usercode of consumer. Why does it stop in the service? In my understanding a FaultException is something which should be passed to the consumer of a service. What should i do to throw a FaultException correctly?