SAP MM is the materials management module of the SAP ERP software package from SAP AG. Materials management is integrated with other modules such as SD, PP and QM. Materials management is used for procurement and inventory management. The module has two important master data - material and vendor. Broadly, the various levels that can be defined for a SAP MM implementation are: Client, Company Code, Plant, Storage Location and Purchase Organization. SAP MM is all about managing the materials i.e the resources of an organization. These resources include man, manpower and materials. The main functionality within MM includes purchasing, Inventory management, valuation and assignment, batch management and classification.