what's the difference?

I have a doubt about the two syntax, just \$PRP@Weight and\$SW-MASS?

Another question is: is it possible for DT to calculate mass forseveral configs parts at the same time. my means are the DT canshow me the results for several configs at the same time after iinput several dimensionals. now i have to use mass properties toassign each config to only get the result of that config.SolidworksConfigurations design Tables