B of H / H of B curves

Hi everyone;
I searched and it seems nobody asked it before.
In the AC/DC module, in either MF/MEF, there is an option to use a constitutive relation of HB-curve, which gives us

|H|=f(|B|).

Is there a way(if it makes any difference at all in COMSOL) to use a BH curve instead, and have B of H instead of H of B, and have |B|=f(|H|) instead?

thanks,
Shoval.