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In my model i have fields Year, YearWeek.
Also in pivot table there is expression , which calculate sum of volume for current selection
In second expression i need to calculate sum of volume for same period, but with prior year.
1. if i select Year 2014, second expression ,must calculate for Year 2013
2. if i select YearWeek 201301,201302,201303, second expression ,must calculate for 201201,201202,201203