Navigational attribute in selection screen gives no applicable data

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Hi Gurus

In the report i am using the navigational attribute in the selection screen.e.g Brand (attribute of material)

My problem is whenevr i enter value in the navigational attribute (brand) in the selection screen and execute its says no data found.

If i do not fill this parameter and fill only the parent attribute (material) in the selection screen , then i can see the results and from its properties (drilling down )i can see the values of brand .

If the values of brand exist why via selection screen its not giving vales, However Via material i can drill down and see brand values.

I have done all the necessary steps to make this attribute as navigational.

On top of this i have this same navigation attributes as one of the characterisitc in the cube.

Thanks

DD