Visual Studio 2008 Query Designer

Hi,

I'm trying design a Model based report in VS 2008, using the Adventure Works 2008 R2 Model.

Inside Query Designer, after select the first Product entity field (Product Category), the entities only shows product subtree. 

If I remove the Product Category from the column fields section, the other entities return to the list.

Could you please help?

Thanks a lot.

João Crespo