Part Custom Property values

Hi all

Im trying to set up a part template for sheet-metal usage, that automatically updates a note in the template that is linked to custom properties.

So that when i create DXF/DWG i wont have to add thickness, material,

But cant seem to get Thickness of part to show the estimated value, but it only wants to show Value/Text Expression.

Material shows esitmated value,

weight shows estimated value

but thickness shows Value/Text Expression

Anyone know why material and weight work but thickness wont?

Attached Template and test part.

SolidworksParts And Features