Assignment of Deliveries to Vehicles and TUs 

Use

Every delivery maps a one-off business event and is represented in the system by a unique document. You can reuse vehicles and transportation units (TUs), on the other hand, as many times as you want to. If, however, you want to make vehicles and TUs unique, you use shipping and receiving activities (S&R activity).

You can manually assign every delivery to a TU and S&R activity in the transaction Maintain Transportation Unit (/SCWM/TU).  You can also automatically assign deliveries to TUs using advanced shipping notifications. In both cases, the system copies the external vehicle number into the delivery when either you or the system assign this delivery to a TU that is assigned to a vehicle.