Materials Management

In normal materials management there are basically 2 basic inventory management systems, the P system and the Q system. 

P system is a system wherein replenishment is done keeping the quantity constant. The period becomes the variant. In other words you fix the quantity you want the stock to dip, to trigger a requirement. As soon as the stock level is reached you replenish the stock. During a lean period the time taken to reach the level will be longer and during an active period the time taken to reach that stock could drop.This normally relates with your consumption based planning. 

Q system is a system wherein replenishment is done keeping the period constant. The quantity becomes the variant. In other words you will check for the level of stock at fixed time intervals (daily, weekly, monthly etc.) compare it with the requirements on that day and trigger the procurement process for replenishment.This normally relates with your MRP.

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In SAP MM materials management, Plant represents a location where valuated stocks are maintained. In other cases, plant can also be looked at as a location for maintaining or servicing. Transaction code OX10 can be used to define a plant in SAP. However, SAP MM requires certain pre-requisites before a plant can be defined in SAP. The three maiin requirements for configuring plant are country keys, factory calendar and region keys.

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Release Procedures (approval) can be used for Purchase Requisitions (PR), Purchase Orders (PO), RFQ’s, Outline Agreements and Service Entry Sheets. The principle is exactly the same for all. If you can master one, you will know them all.

This guide contains an example of release procedures for Purchase Requisition

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Create Purchase Order Automatically in Purchasing

For creation of purchase Order automatically from Purchase Requisitions we need to do the following additional settings in addition to our standard ones.
Activate ‘auto PO’ indicator for material master
Activate ‘auto PO’ indicator for vendor master
Create Purchase Requisitions using T Code ME51 or ME51N
Use T. Code ME59 or ME59N for auto conversion of PR into purchase order

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Introduction:

The material number in R/3 is technically defined as an eighteen byte, character field.The logic that formats material numbers is contained in a conversion exit and is controlled by configuration tables, number range objects and standard R/3 customer functions. This document first explains how material number ranges are defined and then details a few methods for enhancing the standard functionality.

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