Reference Physical iProperties In Parameter Equation

[Natustell]

I need to calculate the mass offset of an assembly relative to an axis. How do I reference an iProperty > Physical (Mass, X, Y, etc) in a parameter equation?

I tried iProperties.mass, iProperties.Value("Physical", "Mass"), and just <mass> and had no luck. I didn't find any comprehensive documentation on Parameter syntax, but I'm still looking.