Assistance with WCF serialization scenario

We need quick assistance from a WCF/Silverlight expert in working out a serialization/data contract issue with a small set of generic/derived classes. The base class is a constrained generic and derived non-generic classes need to be sent between a WCF service and a Silverlight client. ## Deliverables In particular, we are encountering the following error when attempting to add the service reference to our Silverlight client: Warning 3 Custom tool warning: Cannot import wsdl:portType Detail: An exception was thrown while running a WSDL import extension: [login to view URL] Error: Referenced type 'xxx' with data contract name 'x' in namespace '[login to view URL]' cannot be used since it does not match imported DataContract. Need to exclude this type from referenced types. The base generic class has the following signature: **public abstract class GenericTreeNode<T> where T : GenericTreeNode<T>** and as such, the derived classes that need to be passed to/from the client in WCF would have the following signature: **public class DerivedClass : GenericTreeNode<DerivedClass>**