Later, these number ranges are being assigned to different document types we can define to be used in purchase requisition processing. Number ranges in purchase requisitions are required just as in other document, for the purpose of assigning the document number to new created documents. We will cover several topic in this leson that can help understand and create the purchase requisition. They can be converted in purchase orders but only upon release (approval of purchase requisition). Purchase requisitions can be created automatically by system or manually. One of the mere basic documents in Purchasing in SAP is a purchase requisition. A BoM (Bill of Materials) is a list of components and subcomponents a single material is consisting of.
MRP is a system function to determine the material requirements on both the material and BoM level. Procurement doesn’t have to start by the MRP, it can be initiated by consumption based planning or by direct creation of PR or PO. Additionally payment is processed (in FI module). The PR gets converted to Purchase Order and upon goods receipt an invoice receipt can be done to complete the purchasing process. Next step is assigning source to Purchase Requisition, and release of Purchase Requisition. MRP (material resource planning) creates procurement proposal and later gets converted into Purchase Requisition. Purchasing is a component of SAP MM module and its process can be roughly depicted in below diagram.
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