1. Open SuperstoreSales
2. Add Data Tables -> SuperstoreSales again, call it T2.
3. Insert a barchart, use <[Order Priority]> on the x-axis
4. On the y-axis write: Sum([Sales Total]) OVER (AllPrevious([Axis.X])) - Sum([T2].[Sales Total])
(x) Result: An error message saying "OVER expressions can only reference columns in the main data table."
(/) Expected: A correct error message (we ARE infact only referencing columns in the main data table), or a working plot since there is no technical issue why this type of plot configuration shouldn't work.
