Problem: Webdynpro Model of a Webservice doesn't expose members of Baseclas

Hello Everyone
I am very new to WebDynpro Programming and I have a Problem. But let me explain the Situation:
I have programmed a Java Class which is called "Base" and it is abstract.
I have derived another Class from "Base" which I call "Derivat".
"Base" is thereby the Superclass of "Derivat".
"Base" has a few members which I generated public getters and setter methods for.
These functions are visible and working fine in "Derivat".
"Derivat" additionally provides a few more public Functions.
One Function in "Derivat",lets call it "GetByKey", returns an instance of the object Type "Derivat".
Now I have made an Stateful Session Bean which uses the Class "Derivat" and exposes these Functions.
I have used this EJB to generate a Webservice ...
Now the Testpages build into the WebAS shows me that the Function returns a proper instance of object type "Derivat" with all the public member functions declared and defined in "Derivat" and all the public member function declared and defined in "Base".
Now I would like to use this WebService in a WebDynpro Project. I have created the Model in WebDynpro by using a WSDL Link. The Webservice actually is being created successfully in the WebdynPro Project but however when I take a Look at the definition of the Complex Type "Derivat" it only shows me the public member function that have been defined and declared in "Derivat". All the member function of "Base" are completely missing.
Now I have made a few analysis which led me to the folling: The WSDL splits up the Definitions into 2 complex Types! Complex Type is "Derivat" and by definition extends "Base" the other Complex Type is "Base". However "Base" can not be used in the WebdynPro Project since its not exposed / generated by the proxy Class Generator of WebdynPro.
Since this problem is driving me crazy and I have tried a lot of different things, can anyone tell me what I am doing wrong ? What am I missing ?
Any help is really appreciated.
Thanks in advance
Regards
Mike

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Problem: Webdynpro Model of a Webservice doesn't expose members of Baseclas

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