S/4HANA MM Readiness Checklist (Purchasing, Inventory)

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

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Master data

Plan the vendor to business partner conversion (customer vendor integration)CRITICALClean duplicate vendors and unused records before conversionCRITICALReview material number length and external interfaces for the 40 character fieldCRITICALCheck that interfaces and EDI maps handle longer material numbersReview material types, plant and storage location data for obsolete entriesCheck source lists and info records for expired or orphaned data

Inventory and valuation

Understand that material documents are stored in MATDOCCRITICALFind custom code that reads MKPF, MSEG or old aggregate tablesCRITICALPlan the material ledger activation, which is required in S/4HANACRITICALDecide on actual costing and the price determination setupReconcile stock and valuation before the cutoverReview stock reports and custom analyses that rely on aggregate tablesCheck the posting period setup for the new fiscal year variant

Procurement and invoice verification

Identify which purchasing transactions are replaced by Fiori appsCRITICALReview release strategies and workflows for requisitions and ordersCheck output determination, messages and forms after conversionTest the invoice verification flow, including tolerance and blockingCRITICALReview GR/IR clearing and open items before cutoverCheck ariba or external procurement integrations for compatibility

Planning

Evaluate MRP Live (MD01N) against your current MRP runCRITICALReview MRP areas, planning file entries and regeneration needsCheck custom MRP exits and user exits for compatibilityConfirm planned orders and requisitions are converted correctlyCompare sample planning results before and after in a test system

Custom code and project controls

Run the custom code analysis and review the simplification databaseCRITICALRun the SAP Readiness Check or the Simplification Item Check for your releaseCRITICALIdentify custom reports and Z-tables that touch MM dataPlan regression tests for the end to end procure to pay processCRITICALPrepare cutover steps for open POs, open invoices and open stock documentsTrain buyers and warehouse users on the changed screens and appsDefine go/no-go criteria and a rollback plan

Items marked critical commonly cause project delays or defects when missed. Verify each against the simplification item catalog for your target release.

S/4HANA MM readiness discussion

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How to use the checklist

Use it in the early assessment phase and again before the test cycles. Tick off what is already analysed and assign owners to what is not. The critical items usually involve data model changes, such as business partners and material documents, or custom code that depends on the old structure. Export the result to PDF or Excel for your steering group.

Where MM changes most

The biggest structural changes are the business partner as the leading object for vendors, material documents stored in MATDOC and the mandatory material ledger. The material number can be extended to 40 characters, which affects interfaces. MRP Live runs in the database for speed. Several classic transactions are replaced by Fiori apps. SAP publishes the simplification list that describes each change and the required action for your target release.

Business partner replaces separate vendor maintenance
MATDOC replaces MKPF and MSEG as storage
Material ledger is required
MD01N is the HANA optimized MRP run

Common mistakes

Projects often assume MM is a technical upgrade and underestimate data cleansing, especially vendors that block the business partner conversion. Another is leaving custom reports that read legacy tables untested. Teams also forget that interfaces limit the material number length. Finally, plan tests around the full procure to pay flow, because errors often show up only when invoice verification meets the new material ledger.

Frequently Asked Questions

Is the material ledger really mandatory in S/4HANA?

Yes. Material ledger is always active in S/4HANA, though actual costing within it remains optional. Plan for the activation steps and the valuation data migration, and decide on the price determination you want to use.

What happens to my custom reports that read MSEG?

Compatibility views keep many reads working, but performance and results may differ, and writes are not allowed. Run custom code analysis for your release and refactor reports to use MATDOC or released CDS views.

Do I need to change all vendors to business partners?

Yes, S/4HANA uses the business partner as the leading object, and the conversion creates business partners for existing vendors. Clean master data first, since duplicates and inconsistent data slow the conversion.

Does this checklist replace the SAP simplification list?

No. It is a practical prompt list. The official simplification item catalog and tools like the Readiness Check are the authority for your release. Use this list to organize your review and to make sure nothing important is skipped.

If you are weighing an S/4HANA move and want custom code and data quality assessed using AI over your own system, we can discuss how that works on-prem.

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S/4HANA MM Simplification and Readiness Checklist