Problem with if in the expresion. Should i use AGGR?

[#1]

Hi, in this expression

if(SUM({<Mes=, Anio=, TipoCal=>}if (adjudicado=1, CantidadCotizada))

                      - sum({<Mes=, Anio=, TipoCal=>} CantidadEntregada) = 0,

                                  SUM ({<Mes=, Anio=, TipoCal=>} (CantidadEntregada)))

What i'm doing is a sum, but i have this Condition

if(SUM({<Mes=, Anio=, TipoCal=>}if (adjudicado=1, CantidadCotizada))

                      - sum({<Mes=, Anio=, TipoCal=>} CantidadEntregada) = 0

Actually, is a very simple thing. If the sum of the first field - the sum of the second field is equal to 0, we do the sum. And all of those expressions have set analisys, because i dont wanna have my expressions influenced by "mes", "anio", "tipocal"

Ok, here is the problem. The conditional works with the total of Cantidad1 - Cantidad2, but i wanna divide this by "Article" and "Group" for example.

Should i use aggr function? how i use this function with the set analysis?

thank you!

Greetings

[#2]

Can you pls explain what you mean by - divide by "Article" and "Group"

Is this in a straight table?

Can you attach a sample file?

Thanks