When drill-down on series is enabled, a user can click a pie chart to view a detail diagram for the corresponding series value.
Drill-down on series requires that the Series section contains several data items, from the least detailed to the most detailed item
1.Move Date from Arguments down to Series
2.Click Series under the Data tab
3.Click on the Genfund pie
4.Click the return arrow top right and try another Source code Payment Type