BEx WAD - Input validation

Hi All,
I'm using BEx WAD to call a query that allows me to see cost center information according to user authorizations thru the Portal. However, if I type an invalid entry then the application returns everything, including nodes that the user is not supposed to be authorized to see. How do I resolve this? Can I do it thru input data validation? Is there another simpler solution?
Thanks
Marshall.

Marshall,
    How are you providing authorization to Query?
Nagesh Ganisetti.

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