SAP WM to EWM Migration Readiness Checklist
Moving from WM to EWM changes how work is organised, not only the screens. This checklist groups the tasks that most often slip, from design decisions to cutover, and flags the ones that should block go-live if left open.
0 of 34 items complete
11 critical items still open - these are the highest-risk gaps.
Scope and design
Master data
Integration and interfaces
RF, printing and devices
Cutover and go-live
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 and EWM Transaction Codes ReferenceLook up the transaction code you need for transfer orders, bins, stock reports, physical inventory and the EWM monitor.
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