If you'll notice the AGG preceding the calculation, that tells me that the calculation is already Summed, Averaged, Counted, etc., within the calculation and therefore cannot be further aggregated. Hence, Measure is grayed out.
Hope that helps with understanding what's going on there. Thx, Don
To add to Don Wise's comment, there may be an alternative way to get what you need through use of some calculated fields, particularly LODs. If you could share a packaged workbook and explain what you're trying to do with that field, we might be able to find an alternative solution.
Looks like the Measure is already aggregate. To do Aggregations in such a Scenario either Now use WINDOW FUNCTIONS or Start from Scratch with LODs.
Thank you Don.
I am trying to recreate the Box Plot metrics in tabular form across the twelve months of 2018. Deepak and Ken both mentioned LODs as a solution. That will be my next step. I will look to see if a post already exists with the calculated field.
Thank you very much for your quick response.