Validation rules on a column of a table using BI hierarchies

Hi Gurus,

I am facing a new issue...

We are getting the result of a BI query into a table in VC. The results is shown using a hierarchy from BI. So, as an example we display a column "Amount", drilled down by fiscal period represented with a hierarchy based on fiscal year :

                                Amount

2012             

     2012/001            10 CAD

     2012/002            20 CAD

     ...

We want to validate the value of column "Amount" using the validation rules provided by VC. For example, the value should not be negative. It does not work at the line item level, but at the hierarchy node level (2012 in our case).

Has anyone faced the same issue ? Has anyone an idea on how to avoid that ?

Thanks

PY