Model object is not a complex type

Hi all,
when firing up the "execute()" method of an imported enterprise java bean, we see an "Model object is not a complex type" in our server logs. These special method expects a list of objects, which is the only difference to our other methods which only expect a single object (all these methods work).
Is there anything different with collections as arguments?
our code:
custFacadeModel = new CustomerFacade();
customerFind = new Request_CustomerFacadeLocal_find(custFacadeModel);
wdContext.nodeRequest_CustomerFacadeLocal_find().bind(customerFind);
IOurObject o = new OurObject(arg1, arg2, ...);
IOurObject_Item i = wdContext.nodeFindArg().createAndAddFindArgElement().modelObject();
i.setItem(o);
customerFind.addArg0(i);
customerFind.execute();
regards,
Christian

solved since sp3

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