The ATP calculation should use CW units in conjunction with the minimum quantity for catch weight. for CW items.

e.g.

A customer orders 20 pallets of a product having nominal CW = 1000 kg, min CW = 800 kg.

20 pallets are available in inventory with a combined weight of 19,450 kg.

ATP should check for both 16,000 kg (20 x min quantity) and 20 pallets (20 x CW units), and thus assume inventory is available.