SAP ConsultingLogistics
SAP MM - Materials Management
SAP MM follows what a company buys, from the first requisition to the supplier payment, and manages the quantity and value of its stock. Every goods movement creates a material document, and valuated stock gets an accounting document alongside it.
Part of these processes
Process
Procure-to-pay in SAP MM
Each step creates an SAP document that refers back to the previous one, so an invoice can be traced to its order and receipt.
- 01Purchase requisitionME51N · F1643A
From MRP or entered by hand
- 02Source determinationQuota · source list
Assigned by rule order
- 03Purchase orderME21N · F0842A
Sent after approval
- 04Goods receiptMIGO · 101
Stock and GR/IR updated
- 05Invoice verificationMIRO · F0859
Three-way match
- 06 · SAP FIPaymentSAP FI · F110
Blocked invoices are skipped
Decision point
Three-way match
When an invoice is entered, its price and quantity are compared with the order and the goods receipt before payment is allowed.
- Orderprice × quantity
- Goods receiptquantity received
- Invoiceinvoiced price × quantity
Tolerance checktolerance keys
- Within tolerance, open for payment
- Variance too large, payment blockReviewed and released with MRBR
- No goods receipt, invoice waitsGR-based IV does not allow posting yet
GR/IR opens at goods receipt and clears with the invoice; MR11 clears what is left.
Scope
What we configure in SAP MM projects
Organizational structure
Company codes, plants, storage locations, purchasing organizations and groups; valuation at plant or company code level.
Sourcing and contracts
Info records, source lists, quotas, contracts and scheduling agreements, plus multi-supplier RFQs where needed.
Approval workflows
Flexible workflow or classic release strategies for purchase requisitions and purchase orders.
Stock types and special stocks
Unrestricted, quality inspection and blocked stock; consignment, subcontracting, sales order and project stock.
Invoice checks and GR/IR
Tolerance keys, GR-based invoice verification, releasing blocks with MRBR and clearing GR/IR with MR11.
Supplier evaluation
Price, quantity, time, quality and questionnaire scores, weighted in Supplier Evaluation Weighting and Scoring.
Current state
What S/4HANA changed in SAP MM
- Stock sits in one table (MATDOC) and quantities are derived from material documents on the fly. MB transactions such as MB1A and MB1B were replaced by MIGO and BAPI_GOODSMVT_CREATE.
- Suppliers are maintained as Business Partners, and conversion cannot start until customer/vendor integration (CVI) is complete.
- Material Ledger use is now mandatory and actual costing stays optional. Material numbers can be 40 characters long; MRP Live (MD01N) creates requisitions and planned orders in one run.
- LIS-based supplier evaluation (ME61) and classic MRP lists were compatibility pack items: on-premise rights ended in May 2026, while a RISE subscription keeps them to end-2033.
Localization
Türkiye: e-documents and imports
Incoming e-Invoices
UBL-TR invoices from registered suppliers are matched to order and receipt, then posted. A commercial invoice is accepted or rejected in 8 days, else deemed accepted.
E-Invoicee-Dispatch: subcontract and return
SAP DRC can issue e-Dispatch Notes (e-İrsaliye) from a material document for subcontracting, supplier returns or plant transfers, but only to registered recipients.
E-Dispatch NoteImport costs
Freight and customs charges sit as planned delivery costs on the PO; a carrier or customs office can invoice them separately; the invoice is posted after goods receipt.
Import and Export Package
From the field
What we keep running into on SAP MM projects
- The GR/IR account keeps aging. When receipt and invoice differ in unit or price, items never clear. GR-based invoice verification, consistent order units and a regular MR11 run reduce the build-up.
- Invoices sit in payment block. Most of the time the info record or contract price is stale. Price data needs an owner, tolerance keys should be agreed with the business and the MRBR list assigned to someone.
- BP/CVI errors show up during conversion. Missing tax numbers, duplicate suppliers, half-filled addresses. Cleaning the data and running the CVI checks before conversion keeps the plan on schedule.
- Custom code still writes to old stock tables. Writing to MSEG or to the stock fields of MARD raises no error in S/4HANA but has no effect. Find such programs early with ATC and rewrite them to use MIGO or BAPI_GOODSMVT_CREATE.
FAQ
SAP MM: frequently asked questions
What is SAP MM?
SAP MM is the SAP logistics module for purchasing, inventory management and supplier invoice verification. In S/4HANA documentation the purchasing side is called "Sourcing and Procurement" and the stock side "Inventory Management"; the documents stay linked from requisition to payment.
Does MRP create purchase orders on its own?
Not directly. For externally procured materials MRP creates purchase requisitions, or schedule lines when a valid scheduling agreement exists. Requisitions with an assigned source become orders in a separate step, automatically with ME59N or by a buyer in F1048A.
What happens to the e-Dispatch Note when goods arrive short?
The recipient can report the quantity received, the quantity refused and the reason in an e-Dispatch Note Response. Full rejection is only valid before the goods are actually shipped; for goods sent back after partial acceptance the recipient issues a dispatch note of its own. The MIGO goods receipt step and the response process are therefore designed together.
How do RFQs work in S/4HANA?
One RFQ can go to several suppliers. It is created in Manage RFQs (F2049), and the quotations are compared side by side in Compare Supplier Quotations (F2324). An RFQ can also be passed to an external platform such as SAP Ariba Sourcing; the classic ME41 to ME4N transactions are deprecated.
How is supplier evaluation done in S/4HANA?
Supplier Evaluation apps calculate price, quantity, time, quality and questionnaire scores from documents, weighted in Supplier Evaluation Weighting and Scoring. On-premise rights to the classic LIS evaluation (ME61 and related) ended in May 2026. Per SAP Note 2269324, an SAP S/4HANA Cloud Private Edition (new name: SAP Cloud ERP Private) subscription keeps them to end-2033.
How are incoming e-Invoices handled in SAP MM?
The UBL-TR invoice received through the Turkish Revenue Administration (GİB) is read by the integration layer, matched to the order and goods receipt and posted as a supplier invoice in MIRO or F0859. Price and quantity differences follow the normal tolerance rules, and the dispatch note number on the invoice helps the match.
Sources12 sourcesSAP Help Portal, SAP, SAP Support +2
SAP Help Portal
- Simplification List for SAP S/4HANA 2022 - Initial Shipment, Feature Pack Stack 1 & 2 help.sap.com (opens in a new tab)
- Blocking Invoices help.sap.com (opens in a new tab)
- Quantity Variance help.sap.com (opens in a new tab)
- Supplier Evaluation Weighting and Scoring help.sap.com (opens in a new tab)
- Planned Delivery Costs help.sap.com (opens in a new tab)
- Processing Incoming Commercial eInvoices (Turkey) help.sap.com (opens in a new tab)
- Customizing: Outgoing Delivery Notes (Turkey) help.sap.com (opens in a new tab)
SAP
- Time to clean out your S/4HANA wardrobe - replace your compatibility packs: The Way Forward in Detail assets.dm.ux.sap.com (opens in a new tab)
- SAP Cloud ERP Private, RISE with SAP S/4HANA Cloud, private edition and SAP ERP, private cloud edition - Service Description Guide assets.cdn.sap.com (opens in a new tab)
SAP Support
SAP Learning
GİB
Sources checked as of October 2026. SAP Notes require an SAP for Me account.
SAP Consulting
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