Calculated dimension - value null

[#1]

When "Valore" is null, this expression is not valid.

= aggr(sum(If(Um = 'EU' , [Valore]))/sum(If(Um = 'LT' , [Valore])), Mese)

so it return "-" but all calculated dimensions that follow it are not showed.......

When I move back this dimension, I can see the others

What I can do?

thank's for your help!

[ToniKautto]

Please post a sample QVW so that your solution can be evaluated.

[#3]

of course!  the dimension is "PROBLEM"

[#4 · Accepted solution]

I have solved this problem using condition If....

= If(Um = 'EU'  and [Valore] >=0, aggr(sum(If(Um = 'EU' , [Valore]))/sum(If(Um = 'LT' , [Valore])), Mese), 0)