The requirement is really very funny because of the duplication of data.
what I want is today is 25/06/2013(Tuesday), I would like to display the previous week data only that is 18/06/2013,
I tried with a expression =Num(Count({<WEEK={"$(=max({<YEAR={"$(=max(YEAR))"}>}WEEK-1))"}>}NBINVOICES),'# ##0'), it counts the duplicate data of all the week data. I don't know how to add the unique DATE part in the expression.
