RequestFactory with ValueType for interfaces / abstract classes

Hi,
Following is my Model
---------------------------
class Person {
String getName();
Vehicle getVehicle();
}

interface Vehicle {
String getCompanyName();
String getRegNo();
Point getParkingSpaceRequired();
}

abstract class AbstractVehicle {
}

class Motorcycle extends AbstractVehicle {
}

class Car extends AbstractVehicle {
}

------------------------------
so creating PersonProxy as EntityProxy was straight forward, and
working fine for person.getName()
I have created VehicleProxy as ValueProxy and called fire()
with .with('vehicle')

But I am getting
The domain type com....AbstractVehicle$$EnhancerByCGLIB$$e86549b9
cannot be sent to the client.

On PersonProxy I got
@ProxyFor(value=Person.class,locator=PersonLocator.class)

on VehicleProxy I got
@ProxyFor(value=Vehicle.class)

so, How to handle such inheritance in RequestFactory?
Should I change Vehicle to EntityProxy from ValueProxy? Then How to
implement methods of VehicleLocator?

Thank you,

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