I have a ssrs reports with 3 row groups and 2 columns. e.g. Continent > Country > City | Sales | Tax
The user drills down from Continent to Country to City. They can always see Sales and Tax.
i want to hide the tax column when the user drills down to the city level (click + sign on country).
I have tried setting the column visibility based on a expression e.g. =IIF(CountRows("City")>0,False,True). But this gives me an error relating to scope.
Does anyone have any idea on how to do this?