Normalize in BEx

Hi All!!!

In Bex query I have 3 columns: A  B  and A*B

I need to normalise result in  A*B column to sum of total A*B

A  B    A*B AB %

2  2        4      40=4/10

3  2        6      60=6/10

Can I do it ? When I use "Normalize According to Overall Result" - it looks like sum of normalisation = (3+2) * (2+2) = 20 - not 10 = 4+6

thanks to advance!

regards Alexander!