Setup -
In the mapboard section under multi-zoned grid I have a numeric GP named Wealth for each zone, and the value for Wealth is a number.
In the Game Piece Pallette, I have a marker named Control with a layer named Tax set to follow a property. I then tried setting a numeric DP named Tax to the value $Wealth$. When that didn’t work I tried it with a numeric GP named Tax. I added a Global Hot Key to trigger the operation. I tried with the layer above and below the property setting.
When I triggered the hot key, I always got a message stating that the value of Tax was non-numeric; Tax = Wealth.
I got the same message when the DP/GP variable was entered as Wealth or $Wealth$.