SAP MM (Materials Management) manages how an organisation buys and stores materials. It covers purchase requisitions, purchase orders, goods receipts, inventory movements and logistics invoice verification.
MM solves practical problems: buying the right material at the right price, keeping stock accurate across plants and storage locations, and making sure supplier invoices match what was ordered and received.
In S/4HANA, MM sits within Sourcing & Procurement. The material document table MATDOC replaces older inventory tables, Business Partner replaces vendor masters, and Fiori apps support buyers. Many companies also connect MM with SAP Ariba for strategic sourcing and supplier collaboration.