The custom aggregate is needed only if you are slicing the data in each row by some field (Year for example) and you need percentages also sliced by this field, or in other words you have dynamic columns, as explained at the beginning of my last post.
In your case (as shown in the provided excel screenshot), you have only row groups that are dynamic, and the mentioned Exec
function is perfect to implement this scenario.
Please find attached a sample report with the Exec function in action.
And here is the output:
Hope this information helps.
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