variables in Set analysis

[#1]

Hi I am using the below expression and its not working...can anybody tell me what's wrong with that

sum({$<Status_FA={'A'},Month_No={$(var_month)}>}Revenue)-sum({$<Status_FA={'A'},Month_No={$(var_month)}>}Discount)

where var_month is the variable which is assigned the value as field Month_No

Month_No is in date format.

Please help me

[anbu1984]

can you share your app?

[Anonymous]

Anuj,

can you please tell us how you created/declared  var_month and Month_No

else it will  be all guess work ?

anant