This formula has been in use for many months and has suddenly stopped working, and I'm getting an #INVALID OPERATION error.
=SUMIFS([Annual Revenue]:[Annual Revenue], [Project Type]:[Project Type], "Custom Courseware Solution", [Revenue Type]:[Revenue Type], "Delivered")
There are no formulas in the referenced columns. The Revenue Type is populated via an automation, but that has been in place since I started using the formula.
Any suggestions?