SAP WM to EWM Terminology Map
Consultants who know WM well still lose time on EWM vocabulary. This table maps the main WM objects to their EWM counterparts and notes what changes, so you can plan migrations and write blueprint documents with the correct terms.
| Classic WM | EWM equivalent | What changes |
|---|---|---|
Warehouse number | Warehouse number (EWM) | Created separately in EWM and linked to the ERP plant and storage location through supply chain unit mapping. |
Storage type | Storage type | Same idea, but the storage type role and putaway and removal control are set in different configuration steps. |
Storage section | Storage section | Used to group bins for strategies and search sequences, similar in purpose. |
Storage bin | Storage bin | Bin has an aisle, stack and level structure and sorting attributes used for path optimisation. |
Quant | Quant | Stock is held per bin, product, batch and owner. Handling unit stock is tied to the HU. |
Storage unit (SU) | Handling unit (HU) | HUs are the central stock container and can be nested; they are mandatory for many processes. |
Transfer order | Warehouse task | One task per move. Tasks are grouped into warehouse orders for execution. |
No direct equivalent | Warehouse order | Groups tasks for one worker or resource, built by warehouse order creation rules. |
Transfer requirement | Warehouse request and delivery | Requests arrive from ERP as inbound and outbound delivery documents and are processed in EWM. |
Posting change notice | Posting change | Handled as a warehouse request document for stock type or ownership changes. |
Stock placement strategy | Putaway control and storage type search sequence | Determined by the warehouse process type, the storage type search sequence and the product's putaway control indicator. |
Stock removal strategy | Stock removal rule and storage type search sequence | Removal rules define the sequence such as FIFO, partial quantity first or largest quantity first. |
Movement type | Warehouse process type | The process type controls the activity, such as putaway, picking or posting change, and many defaults. |
Picking wave | Wave | Waves are created from templates with rules for wave category, release and pick completion. |
Two-step picking and group picking | Picking by warehouse order creation rule and two-step picking process | Warehouse order creation rules decide how picks are bundled; consolidation groups handle two-step picking. |
Physical inventory record | Physical inventory document | Procedures include storage bin check, cycle counting and low stock check in EWM. |
Interim storage types 902 to 910 style | Staging areas, work centers and door bins | Areas for goods in, goods out and quality handling are modelled with staging areas and work centers. |
Lean WM | Not applicable | EWM is always bin and HU level; Lean WM has no EWM counterpart. |
RF queue | Queue and resource | Resources represent people and equipment, and queues route work to them. |
Labor management reports | Labor management in EWM | Engineered standards and performance tracking are part of EWM labor management. |
This is a conceptual map, not a one to one configuration mapping. Names of configuration steps differ by release, so verify against the IMG for your system.
WM to EWM blueprint review
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How to use the map
Search the Classic WM column for the object you know, then read what it becomes in EWM and what changes in behaviour. Export the table to Excel and add columns for your own configuration status per warehouse. Use it in blueprint workshops with warehouse supervisors who know the WM names but need to understand how work will be organised in EWM.
The three biggest conceptual changes
Three differences cause most of the design effort. First, the handling unit replaces the storage unit as the main stock container, so pallet and carton handling must be rethought. Second, work is organised in warehouse orders created by rules, rather than transfer orders created by delivery or manual action. Third, strategies are split between warehouse process types, putaway control and storage type search sequences, which gives more flexibility but more configuration.
- HU management is fundamental, not optional
- Warehouse order creation rules shape the picker's day
- Process types replace movement types as the control object
Common mistakes in WM to EWM projects
A common mistake is copying WM storage types one to one, which carries old workarounds into the new design. Interim storage types in WM often become staging areas and work centers, which behave differently. Another mistake is underestimating RF redesign: screens and flows change, so operators need training and testing before go-live.
Frequently Asked Questions
Is a transfer order the same as a warehouse task?
Conceptually close, since both describe a movement from a source bin to a destination bin. In EWM tasks are grouped into warehouse orders and are created and confirmed through different processes, so the behaviour around creation and confirmation differs.
Why are handling units mandatory in many EWM processes?
EWM stock handling is built around the HU as a container with its own identity. Many processes such as pallet putaway, packing and shipping use HUs, so master data like packaging specifications must be maintained.
Can I migrate Lean WM to EWM?
Lean WM has no EWM counterpart. You would design bin and HU level processes in EWM if you need warehouse detail, or stay in inventory management if you do not. This is a design decision, not a data conversion.
What replaces movement types in EWM?
Warehouse process types control the activity and many defaults for a movement in EWM. They are assigned by determination from the document type and other criteria. Inventory management movement types still exist in the ERP layer.
If you are weighing a move from WM to EWM and want a second opinion on the design, Netray can review the blueprint with you and show where AI assistants can help with data checks.
Related Tools
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