ytd , how can i do this ?

[Anonymous]

hai    

i have 3 feilds: 1 - year 2 - month 3 - sum kg

i want to calculate the ytd for the "sum kg".

i uesed :

SUM({<year={'$(vMaxYear)'},month={'<=$(vmaxMonth)'},year=>}{$<_Flag={Inv,InvAdel}>}sum kg

)

but it's show me only the current month.

how can i do it?

thanks'

yarin.