SAP MM module is a part of logistics and it helps in managing end to end procurements and logistics business process. Main features of this module are requisitions, purchase orders, goods receipt, Accounts Payable, inventory management, BOM's and master raw material, finished goods etc.
Requisitions in SAP MM module is a document created for purchase of goods or services, it is sent to procurement office for the issuance of purchase orders. Requisitions exceeding certain amount need vendor verification in SAP MM module. There are two ways of placing requisition either through SAPGUI or SAP web.
Purchase orders are legal document issued as commitment to the vendor to supply mentioned material in the specified quantity along with shipping details and specification. The authorized vendors list is displayed while creating purchase order as per material and plant of the organization.