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SAP MM

SAP MM – Materials Management Overview

SAP MM (Materials Management) is a core module in SAP ERP and SAP S/4HANA responsible for procurement, inventory management, material valuation, and vendor management. It ensures material availability with optimal cost and accurate stock levels.

1. Key Functions of SAP MM

Procurement (Purchasing)

Manages complete procurement cycle: PR → PO → GR → IR → Payment. Supports external procurement, subcontracting, stock transport orders, and consignment.

Inventory Management (IM)

Tracks material movements: Goods Receipt (GR), Goods Issue (GI), Transfer Postings, Physical Inventory. Handles unrestricted, blocked, and quality inspection stock.

Material Master Management

Centralized master data for materials used across modules. Views: Basic Data, Purchasing, MRP, Accounting, Sales, Warehouse, Quality, etc.

Vendor Master Management

Stores supplier information – purchasing & accounting views. Integrated with FI (Accounts Payable).

Invoice Verification (MM-IV)

Part of logistics invoice verification. Matches PO, GR, and Supplier Invoice (3-way match).

Valuation & Account Determination

Manages material valuation (Standard/Moving Average price). Auto determination of GL accounts via OBYC settings.

Material Requirement Planning (MM-MRP)

Automated planning to ensure material availability. MRP Types, Lot Sizing, Reorder Point, Safety Stock.

2. Submodules of SAP MM

  • MM-PUR: Purchasing
  • MM-IM: Inventory Management
  • MM-VAL: Material Valuation
  • MM-IS: Information System
  • MM-IV: Invoice Verification
  • MM-CBP: Consumption-Based Planning

3. Important Documents in MM

PR

Purchase Requisition – internal request for materials

RFQ

Request for Quotation – invites vendor quotes

PO

Purchase Order – ordering document

Contract

Scheduling Agreement – long-term procurement

GR

Goods Receipt – material received

GI

Goods Issue – material issued

T-Codes

MIGO/MIRO – major transaction codes

4. Major Integrations

With SAP-FI:
  • Automatic G/L account determination using OBYC settings.
  • Inventory valuation updates reflected in Balance Sheets in real-time.
  • Three-way match validation for Logistics Invoice Verification (MM-IV).
With SAP-SD:
  • Stock availability check (ATP) for meeting sales order requirements.
  • Efficient handling of Stock Transport Orders (STO) and third-party sales.
With SAP-PP:
  • Automated Purchase Requisition generation through MRP runs.
  • Seamless Goods Issue of raw materials to Production Orders.
With SAP-WM/EWM:
  • Precision tracking of material movements at the storage-bin level.

5. Common Transaction Codes (T-Codes)

Purchasing
  • ME51N
  • ME21N
  • ME41
  • ME11
  • ME01
Inventory Management
  • MIGO
  • MIRO
  • MB1A/MB1B
  • MBRL
Master Data
  • MM01/MM02
  • MK01/XK01
MRP
  • MD01/MD02
  • MD04

6. Business Benefits

• Optimized inventory levels

• Strong supplier management

• Reduced procurement cost

• Improved production planning

• Accurate stock visibility

• Seamless integration with finance & logistics

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