Surely correct unit for IfcModulusOfRotationalSubgradeReactionMeasure?

I cannot find this type of measurement or the mechanical model it belongs to elsewhere. The IFC docs say that the unit is Nm/(m*rad). I have no opinion on this, but for my mapping would have to add this unit to QUDT, which I would not want to have done and later it turns out that the unit is actually not needed... and it seems to me that this might actually be a case of torque per angle (Nm/rad).

Thanks for a quick verification!

EDIT: if Nm/(m*rad) is the correct unit, would you consider normalizing it to N/rad?