Apply set analysis in pivot table

[Anonymous]

Hello Guys ! I need some help!

I'm using a pivot table with 2 dimensions : MonthYear and id_code.

In expression, i have :

Count( DISTINCT Aggr (   if((( SUM(x) + SUM(y)) = 0), code1), code1, MonthYear))

I want to select 1 month in pivot table and show the month selected + 2 previous month. If select in pivot table october, show september and august.

How to do it?

Thanks !

Morandi