pivot table calculated field

[Marc96]

Hi,

I have a pivot table  with two dimension and one expression:

- Dimension --> 1) Macrofamily, 2) Brand

- Expression --> Turnover

 i would calculate the relationship between Brand "KAPPA" and Brand "GIVI". A relationship between two values of the same Dimension. (Ex. on the first row of the below table the relationship will be 5,21)

Have someone the solution?

Many thanks in advance