Cannot make work a Set Expression

[cristian_av]

I

I'm trying to create a expression to Sum "VolumenReal" with the field PeriodoNumVol having the selection equal to all possible values of the field PeriodoNum.

PeriodoNum and PeriodoNumVol has date values (Year-Month) as this:

201601

201602

201603

201604

My expression (not working) is this:

=Sum(  {$<PeriodoNumVol = {">$(=Min(PeriodoNum))<$(=Max(PeriodoNum))"}>}   VolumenReal )

Can anybody help me please?

Thanks!

[sunny_talwar · Accepted solution]

May be this:

=Sum( {$<PeriodoNumVol = {">$(=Date(Min(PeriodoNum), 'YYYYMM'))<$(=Date(Max(PeriodoNum), 'YYYYMM'))"}>} VolumenReal)