Question Help with Occlusion Culling

Hello,
I have the main scene with the camera and some other common objects.
However, all level geometry is in different level scenes, which are loaded as addictive.
I've created an Occlusion Area and baked it in the level scene.
But when I load the level (main scene + level scene with baked occ. area) it shows me that occlusion data is not baked. So, I'm not sure if I did it the right way.
Any help is wanted here.
The main question here is if I bake my occlusion in an additive scene, will it work if the camera is on the main scene. And how I can debug/view this setup?

Thanks in advance.

 

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Anyone?