Jasper Reports Groups and Calculating Percentages of each group of the total

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I have a data series like the following

Year Month Item SaleCount
2020 Jan Apple 2
2020 Jan Banana 3
2020 Feb Apple 1
2020 Feb Banana 3
2020 March Apple 5
2020 March Banana 0
2021 Jan Apple 5
2021 Jan Banana 3
2021 Feb Apple 2
2021 Feb Banana 7
2021 March Apple 5
2021 March Banana 2

I am grouping data By Year then By Month then By Item Type

I would like to to show the percentage sales of each item as a function of the monthly total. However this is problematic given I use a variable reset on the Month Grouping to count total sales for that month. Then I tried to use F{SalesCount}/v{Total_Monthly_Sales}/100

as the v{Percent_of_Total} But as that variable is still being calculated dynamicaly during the internal Item lines basically for the first item its 100 and then each subsequent item is a percentage of the incrementing count..and not valid. The Total Sales are really on valid when the monthly group has finished being generated. The only solution I can see is use a sql calculation to produce a monthly total field and use this in my percentage variable.



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