Only beans implementing the TraitableBean interface can be used with "don" and "shed". If a non-traitable object is processed, the engine creates a proxy to add the required behavior. In versions up to 6.1.B4, this proxy appears EQUAL but not the SAME as the original fact. This will break the lookup of the handle if the user keeps a reference to the original object and tries to use it (e.g. to re-insert or delete the object)