Waterfall error with value containing switch

Hi.

I'm having trouble with a waterfall chart output whereby the value for each category returns 0 (seen in red in the screenshot). The value slices correctly with the elements when in a table or matrix visual (seen in green below), so I can't see why it wouldn't work with the waterfall.

The only complexity is that the [PR Value] uses a switch statement so that the data can be viewed in an unpivotted format.

E.g. [PR Value] := SWITCH( SELECTEDVALUE( Revenue[Element]),

"GGR", [GGR],

"Bonus Costs", [Bonus Costs],

...

0)

Waterfall error

Can anyone provide some insight as to why this won't work?

Thanks.