Vehicle 
A specialization of a particular means of transport. A vehicle can comprise one or more transportation units.
You define vehicles in the master data for transportation. You use vehicles to group transportation units and to communicate with invoicing and freight order management.
It is not mandatory to use vehicles in shipping and receiving if the features available at transportation unit level are sufficient for your transportation processes.
If you assign transportation units to a vehicle in a fixed way, you cannot assign these transportation units to another vehicle. In this case, data that you define for the vehicle is also valid for the assigned transportation units.
The dimensions of the vehicle come from the means of transport that you assign to the vehicle, and are used as the planned size.
You can print waybills for vehicles. For more information, see Print Forms in Shipping and Receiving.
Integration
For processes with transportation planning in ERP, you can create a vehicle from an ERP shipment. You can use the ERP shipment number as the external vehicle number.
For processes with transportation planning in EWM and communication to ERP, you can create an ERP shipment from a vehicle. You can use the external vehicle number as ERP shipment number.
Before goods issue posting, you can create the current invoice via an invoice request to SAP CRM Billing or to SAP ERP. For more information, see Invoice Creation Before Goods Issue.
Example
The truck with the license plate number HSK-116 has a trailer. This means that it consists of two transportation units: The cargo area and the trailer.
More Information
See also, Shipping and Receiving in Inbound and Outbound Processes.