I am trying to create a check mark option for my Revit models to alter the thickness of the frame on my windows. I don't think the people who will be using the models will want to keep track of the two options for thickness, so I would like to have the values programmed in already. I keep getting an error message of "Improper use of boolean expressions". I'm worried that means this is not possible. Right now my formula says if(VWide Bar="true",2,7/16)
