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You may find sample data as attachment qvw.
I need to combine both accumulation and drill-down periods (Year-Month-Date).
I tried an expression below but it doesn't show an expected result when selected specific Year or Month.
For example select Year=2015. It has correct data. The last month(Dec) of Group1 shows value=16425
If select Year=2016 first month(Jan) shows value=930. It takes value from Jan 2015 (1395) and accumulate to value Jan 2016 (-465).
Instead that it should take accumulated value on Dec 2015 (16425) and add value from Jan 2016 (-465) = 15960
One important thing that items are not the same year to year. In this case I think can't be used peek or previous on script side.
Any help would be highly appreciated.