Flex and java web combined module from eclipse to idea

Hi all:

I have an old project implemented with flex and java web in eclipse.

Now,I want to import it to idea. But,

if I tried to import Eclipse project (module from external model->eclipse) Idea understands only java/web related stuff

if I tried to import FlashBulder (module from external model -> Flashbuilder) idea picks only flash related stuff.

It's the same question with link http://devnet.jetbrains.com/thread/437473. The answer suggested using two modules. But my modules share the same root.

why cant I add two facets(flex and java web) to the whole project？

It's essential for me  to debug the two parts together. Can anybody help?

p.s I'm working with idea 13 ultimate.