Yes... I still like 'em 35 years later...
Crossing an army boundary where the unit would be departing its own army’s zone during Operational Movement Phases costs each crossing German unit two additional movement points.
German units may cross other boundaries, cross into their own army’s zone, and also retreat, exploit, or strat-move across any and all army boundaries with no restriction.
What about moving a Reserve Unit during the Breakthrough Movement Phase? They make a "normal operational move" but since they are not in the Operational Movement Phase, do they pay the extra 2 MPs?