SET expression YTD how to change to Last month ? if user not select year and month.

[paulyeo11]

Hi All

I have below expression display YTD target amount  is working fine :-

SUM({<year = {'$(=Max(year))'}, month = {"<=$(=IF(GetSelectedCount(month), Max({<year = {'$(=Max(year))'}>}month), Num(Month(Today()))))"}>}sales_target/Rate/1000)

usually i can make use of below expression to make it work :-

Sum({$< Month_n  ={"2"}>} sales_target/1000)/Rate 

But due to Month_n field is not link to sales_target , so i have to use SET analysis.

Hope some one can advise me.

Paul Yeo