Pivot table: Building Calculations

Question

Hi,
i've following problem. Actually I have a pivot table with 4 columns (say A,B,C,D).
Example
Region| A | B | C | D
Berlin |7 | 4 | 1 | 4
Bonn |3 | 2 | 1 | 3
Total |10| 6 |2 |7
Each column item has as rule of aggregation SUM.
Now my customer wants that column B isn't a sum of each row value, but that it's calculated as SUM(column B) / SUM(Column D)
So my example must be:
Region | A | B| C| D
Berlin | 7 |4 | 1 |4
Bonn | 3 |2 | 1 |3
Total |10 | 6/7| 2| 7
is it possible?
Thanks
Giancarlo

Answer 1

Thanks,
but i believe there was a BI built-in functionality. Your idea is wonderful, but it isn't applicable in my scenario. For example Total row unlike other rows must have a blue blackground color and with conditional formatting i can format only column Region, but not columns A,B,C,D that are measures.
Then, column Region elements (Berlin and Bonn) are drillable. In this way, even Total element become drillable, and it isn't good...
Thanks
Giancarlo