I have a report query that has "Year" as a parameter. If user selects 2016 in the parameter, the query produces 2016 values in a column named "SelectedYear", and 2015 values in a column called "PreviousYear".
I want the legend for the bar chart to then be 2016 and 2015 respectively. If I go Series Properties - Legend - Expression and I do =Parameters!Year.Value, THIS one gets 2016.
If I do =Parameters!Year.Value - 1 for the other one, the legend name remains the column name instead of 2015.