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How can i obtain the cumulative sum for each product like the column ?
You have to do it in the back-end.
Create a new field with using this formula:
If(prod = Previous(prod), (gg + Previous(gg)), gg) as CumulativeSum
*don't forget to put order by clause in where condition (Order By date, prod)
attached link for the similar issue: Similar Post
Let me know if works.
I can't because gg is a measure. In the script i don' t have this field,it is a variabile value.