Warehouse operations and transportation planning are two logistical processes that should work tightly integrated, as one does affect the other. Your transportation planning, and therefore the knowledge which deliveries will finally be transported together, can influence the picking planning and the creation of waves in the warehouse. On the other side, depending on your operations, the availability of products or resources in the warehouse might control the possibilities of loading trucks or other means of transport and therefore be your actual transportation planning.
SAP EWM offers different approaches to transportation planning, depending on the requirements in your warehouse:
"Planning" transportation by creating transportation units in SAP EWM is the most simplest way. When using the shipping cockpit or the reports for automatic creation of TUs, loading weight and volume limits of the packaging material used for the TU can be considered, but otherwise the assignment of warehouse requests to TU is based on simple rules or completely manually. You can use the post processing framework to print a waybill or a freight list. It is also possible to send the information to other transportation planning systems.
SAP ERP Transportation (LE-TRA) enables the manual or automatic creation of shipment documents, where you combine inbound or outbound deliveries which are transported together. An IDoc can be send from a shipment document to SAP EWM for shipment information. Once the shipping process is finished, SAP ERP can create a shipment cost document for cost settlement with the freight forwarder or service agent. LE-TRA is included in SAP S/4HANA as part of a Compatibility Pack and can be used until 31st December 2025. For details see the SAP Notes, 2269324 - Compatibility Scope Matrix for SAP S/4HANA on-premise and 2270199 - S4TWL - Transportation (LE-TRA).
SAP Transportation Management (TM) is a comprehensive solution for performing all activities connected with the physical transportation of goods from one location to another. It can create an efficient transportation plan that fulfills the relevant constraints (for example, service level, costs, and resource availability). You can plan manually or use the vehicle scheduling and routing (VSR) optimization for the automatic creation of freight documents. The integration of SAP TM is possible through LE-TRA or directly with SAP EWM.
In general, the object to represent the transport in SAP EWM is always a transportation unit (plus vehicle, if this is desired).

Besides the classic integration scenarios, SAP S/4HANA 2020 offers the advanced shipping and receiving, which is in fact a simplification topic, as it does not require the use of a transportation unit for the TM integration anymore. Details are described in a separate section.











