Hi to all.

Thanks for your kind reply and your interest to my problem.

I tried to write as you suggest to me ,,but it does not solve problem

'SUM([SalesAmount]) - SUM((ParallelPeriod([Calendar].[DateAAAAMMGG].[Year], 1, [Calendar].[DateAAAAMMGG].CURRENTMEMBER),[SalesAmount]))'

Writing this expression it works only if i select:

Year = 2013 and Month = 5 and only ONE DAY Day = 24

If i select MORE ONE YEAR or MORE ONE MONTH or MORE ON DAY...i receive Null value

or better i receive only the value of SUM([Num Entrate]) because all part of expression with PARALLELPERIOD does not able to do a result...

Any suggest ???

I will try to understand better...

Thanks...:-)