How can I get an equation driven custom property to update with different part configurations?

Hi All,

I am making flat pattern drawings from a bent panel design with many different sized configurations and I am attempting to add a line to the sheet format that contains the surface area. This references a custom property I created, driven by an equation that divides the overall surface area in half to give me a rough idea of the cut part size.

However, when I make a reference to this property in the drawing, it fails to update with the other custom properties wen I change the configuration in the view. I am assuming this is because it is equation driven, but I would really like to be able to make this work. Any ideas?

Much appreciated!

SolidworksDrawings And Detailing