Attached effect in modelconverterx problem

Hello Arno hello everybody!
I've an issue in attaching a very simple ". fx" effect with modelconverterx,using the attached object editor.
If i attach the effect in the "normal" mdl, the external aircraft model, there is no problem, it works.
If i attach the same effect in the "interior" mdl, the virtual cockpit, the effect wont show.

Can anyone confirm that VC cannot contain fx effects?
If so, is there any workaraound?
Thanks a lot!