XmlMarshalException on using XI generated Webservice with WebDynpro

Hi,
i have a problem creating a WebDynpro application using a WebService model created by XI.
When executing the service:
public void onActionGO(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
//@@begin onActionGO(ServerEvent)
try {
wdContext.currentRequest_MI_BESCHAFFUNG_MI_BESCHAFFUNGElement().modelObject().execute();
wdThis.wdFirePlugToMIBeschaffungResultView();
catch (Exception e) {
wdComponentAPI.getMessageManager().reportException( e.getLocalizedMessage(), false );
//@@end
I get the following error message:
Service call exception; nested exception is: com.sap.engine.services.webservices.jaxrpc.exceptions.XmlMarshalException: XML Serialization Error. Property [DATA] of class [de.gisa.mibeschaffung.model.proxies.types.RFC_READ_TABLE] must exist and can not be null. This is required by schema description.
The classes generated by the WSDL import are prefixed by ComplexType. So could this be the culprit here? Also the generated classes are in the de.gisa.mibeschaffung package not in the de.gisa.mibeschaffung.model.proxies.types package.
I appreciate your input!
regards
Dirk

How do you suggest converting those inputs?
Using a Netweaver Developer Studio generated model (from a
WSDL description in turn generated by XI) should shield one from the actual programming tasks required to do that.
Am i mistaken about that?

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