Although we design in English units for most parts, we are using metric sheetmetal thicknesses. We have therefore changed the unit for the SMT_THICKNESS parameter and set it to be calculate. When we update the thickness dimension, it does not flow back up to the SMT_THICKNESS parameter and convert to the metric value. This parameter would be used in model-based-definition annotations (like 1mm thickness, 1.2mm thickness, etc). We want it driven from the english dimension so there are no inconsistencies.