When you bundle two or more empty containers, N4 updates the Gross Weight of the primary unit in the bundle based on the INVWEIGHT001 (INCLUDE_PAYLOAD_WEIGHT) (on page 1) setting. If INVWEIGHT001 is true, N4 adds the Tare Weight of the payload units to the Tare Weight of the primary unit since the freight kind is MTY. If INVWEIGHT001 is false, N4 does not add the Tare Weight of the payload units to the Tare Weight of the primary unit.
N4 calculates the gross weight of the primary unit as a sum of primary tare weight and payload tare weight since the freight kind is empty. The Gross Weight of the bundle is calculated in N4 as per the below formula and the information is passed on to XPS and ECN4.
Primary Unit Gross Weight = Primary unit tare weight + Payload A tare weight + Payload B tare weight
Creating a bundle does not change the Tare Weight of the units in the bundle.