If only the leg and total weight are relevant for you, it is sufficient to perform a calculation at the level of the shipment cost item. In this way, you achieve the greatest clarity, as additional data from deliveries or handling units is superfluous.

If you draw up your contracts with the forwarding agent in such a way that the system performs a calculation per wire box, then you should use the calculation basis for handling units. All data relating to weight and volume then refers to the handling units.

If you charge each ship-to party but do not require any delivery item information, you can select the calculation base for deliveries.

If you must take different freight classes into account in the calculation, you require material data from the delivery item and must therefore perform a calculation per delivery item.

If you use a package shipment and must calculate each shipping unit separately, use the calculation basis per handling unit.