Set Modelica Derivative Units

Question

I know I can define parameter units like so:

parameter Modelica.SIunits.Mass m0 = 2 "Mass";

And the units of state variables like so:

Real m(start=m0, fixed=true, min=0, max=100, unit="kg");

But how can I define the units of a derivative? (Or are these generated automatically? It may be that JModelica, which I am using, simply does not check units.)

der(m) = m*u;

Answer 1

Dymola does this automatically for you. OpenModelica does not. So I guess it's probably something also missing in JModelica.org.