Architecture, structure & deployment

Embedded EWM runs inside the SAP S/4HANA system and shares master data (product, BP, batches) directly. Decentralised EWM runs on a separate S/4HANA instance connected to one or more ERP systems — chosen for high-volume, highly automated or 24×7 warehouses that must keep running during ERP downtime. Legacy SAP EWM on SCM 7.0 uses CIF to transfer master data.

• Embedded: no master-data replication, simpler landscape, shared database.
• Decentralised: independence, scalability, can serve several ERPs; uses qRFC and master-data distribution.
• Both use the same EWM application code in current S/4HANA releases.

S/4HANA includes basic warehouse management in the core licence; advanced features need an additional licence. Advanced capabilities include Material Flow System, labour management, cartonization planning, dock appointment scheduling, yard management, kitting, VAS, cross-docking and slotting.

• Check the current feature scope description for your release before promising a feature.
• A warehouse number can be flagged as basic or advanced.
• Many inbound/outbound basics (RF, waves, HU, POSC/LOSC) are in basic scope.

The warehouse number is the top level, mapped to plant/storage location in S/4HANA. It contains storage types (physical or logical areas), storage sections (e.g. fast/slow movers), and storage bins. Activity areas group bins for an activity (picking, putaway, PI), and work centres represent pack, deconsolidation, VAS or QI stations.

• Storage type role: standard, work centre, identification point, pick point, staging area, door, production supply.
• Staging area groups and doors connect the warehouse to yard and shipping.
• Supply chain unit (SCU) represents the warehouse as a location for business partners and the organisational model.

T-codes & apps

/SCWM/LS01/SCWM/LS03/SCWM/SBUP

Configuration

IMG › SCM Extended Warehouse Management › Extended Warehouse Management › Master Data › Define Warehouse Numbers / Define Storage Type

Plant + storage location are mapped to an EWM warehouse number. ERP deliveries for EWM-managed storage locations are distributed to EWM, which creates its own warehouse request (inbound delivery, outbound delivery order). EWM confirms goods receipt/issue back to the ERP delivery.

• Settings: assign warehouse number to plant/sloc, map ERP warehouse to EWM warehouse, define distribution of deliveries.
• Communication uses qRFC queues — monitor with SMQ1/SMQ2 (and /SCWM/MON for documents).
• Embedded EWM still distributes deliveries internally via the same integration layer.

T-codes & apps

SMQ1SMQ2/SCWM/MONVL06IVL06O

In decentralised EWM on S/4HANA, material, BP, batch and classification data are distributed with ALE/data replication (DRF). Legacy SCM-based EWM used the Core Interface (CIF) with integration models.

• Embedded EWM needs none of this — it reads S/4HANA master data directly.
• CIF (legacy): CFM1 creates and CFM2 activates integration models; queues are monitored with SMQ1/SMQ2.
• Plan master-data replication monitoring as a support process.

T-codes & apps

DRFOUTBD64CFM1CFM2 (legacy SCM EWM)