SAP WM to EWM Migration Readiness Checklist (Free)

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11 critical items still open - these are the highest-risk gaps.

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Scope and design

Deployment option decided (embedded EWM or decentralized EWM) and agreed with SAP basisCRITICALEach warehouse number mapped to an EWM warehouse and a supply chain unitCRITICALStorage types reviewed one by one; WM workarounds not copied by defaultInterim storage types redesigned as staging areas, work centers or door binsCRITICALPutaway and removal rules documented per product groupWarehouse process types and determination definedWave and warehouse order creation rules designed with supervisorsHandling unit policy decided per process (pallet, carton, loose)

Master data

Warehouse product data cleansed, including units of measure and dimensionsCRITICALPackaging specifications defined for products handled in HUsCRITICALStorage bin structure and sorting attributes definedBin capacity and bin type data reviewedBatch management settings aligned between ERP and EWMBusiness partner and owner data set up where neededActivity areas, resources and work centers created

Integration and interfaces

Delivery integration between ERP and EWM tested for inbound and outboundCRITICALGoods movement posting back to ERP tested, including reversalsCRITICALStock reconciliation report agreed between ERP and EWMInterfaces to carriers, label printers and conveyors identifiedError handling and monitoring defined for queued messagesCustom code from WM reviewed for rewrite or retirementAuthorisation roles drafted for supervisors and operators

RF, printing and devices

RF screen flows designed and tested on real devicesCRITICALHandheld hardware and Wi-Fi coverage checked in all areasLabel formats for HUs and bins defined and printed on the real printersOperator training plan scheduled with enough hands-on timeSuper user group named per shift

Cutover and go-live

Stock migration approach chosen (inventory based load or physical count)CRITICALOpen transfer orders and deliveries cleared or migrated before cutoverCRITICALPhysical inventory plan agreed around the cutover windowAt least one full dress rehearsal of the cutover completedCRITICALRollback criteria and decision time agreedHypercare roster covers all shifts for the first weeksDaily stock reconciliation scheduled for the first weeks

Every critical item should be ticked before go-live. If more than two critical items are open, treat that as a reason to review the date.

EWM readiness review

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How to use the checklist

Work through each group with the relevant owners and tick the items you can evidence, such as a signed design document, a test result or a completed rehearsal. Items marked critical are those that, in practice, cause disruption on the floor when missed. Export the checklist to PDF to attach it to a gate review, or to Excel to add owners and dates.

Why these groups

Design problems come from copying WM structures. Master data problems are the biggest hidden cost, since EWM needs dimensions, units and packaging data that WM often lacked. Integration issues appear at the boundary with ERP where deliveries and postings flow. Device and printing issues are small technically but stop work immediately on the first day. Cutover is its own risk because stock and open documents have to match between two systems at one moment.

Common mistakes

Projects commonly start RF testing too late. Operators then see the screens for the first time during training and find flow problems that need design changes. Another frequent mistake is migrating stock without clearing open transfer orders, which leaves stock in states that cannot be mapped. Plan a freeze period for new orders before cutover and agree how late deliveries are handled.

Frequently Asked Questions

Do I need to count stock for the migration?

Not always. Many projects load stock from WM and reconcile, then count afterwards. Others count during the cutover window. The right approach depends on stock accuracy, value and downtime tolerance, and should be agreed with finance and auditors.

How long does a WM to EWM project take?

It varies widely with warehouse count, automation and customisation. A single simple warehouse can take a few months, while multi-site projects with automation take much longer. Treat any quick estimate with care until the design is known.

What is the most underestimated task?

Master data preparation. EWM needs accurate product dimensions, weights, units of measure and packaging specifications, which are often incomplete in WM. Cleaning them takes real effort from business owners, not just IT.

Should I use embedded or decentralized EWM?

Embedded EWM runs in the S/4HANA system and is simpler to operate for many companies. Decentralized EWM runs in a separate system and suits very high volume or separate release cycles. Decide with SAP basis, based on volume and landscape.

If you want a second review of your EWM readiness, or help building data quality checks on warehouse product data, we can walk through the list with you.

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SAP WM to EWM Migration Readiness Checklist