RequestFactory create proxy object serverside

Using RequestFacory I am trying to create an object on the server like this:

public imterface FooRequestContext extends RequestContext

{

    Request<FooProxy> createByBarId(String barId);//create new Foo object (dose not persist it)

    Request<FooProxy> calculate(FooProxy foo);

} 

createByBarId works fine but when I call calculate I get: Server Error: The requested entity is not available on the server.

I think I understand the reason for this error. But is there any way to tell RequestFactory that this object has not been persisted jet and force it to send the whole object, not just the diff? Just as if it had been created using requestContext.create(FooProxy.class) .

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