Master Data

The master data component (PP-MRP-MD) forms the basis for MRP. Master data for MRP includes:

Net Requirements Calculation

The net requirements calculation can be carried out for both standard materials and materials with segmentation.

In MRP, requirement quantities are maintained in the system as planned independent requirements, customer requirements, as well as forecast requirements. For more information about net requirements calculation in the standard ERP system, see Net Requirements Calculation.

For materials with segmentation, requirement to stock allocation depends on the settings you have defined in the Requirement/Stock Allocation table in Customizing for Define Segmentation Strategies under  Logistics – General Segmentation .

The system considers available stock and future receipts. If there are multiple stock segments that can be consumed by a certain requirement segment, you can define the sequence for consuming the different stock segments using the Consec.No for Eq Seg option in the Requirement/Stock Allocation table.

If stock is available, the system determines the requirement segment that should be assigned to the stock segment. If the required quantity of a particular stock segment is not available, the system may use another segment if it is defined in the segmentation strategy.

If no stock is available, the system determines the stock segment to be procured.

Lot-Sizing Procedures

MRP calculates the procurement quantities for purchase requisitions using the lot-sizing procedures. For more information about lot-sizing procedures in the standard ERP system, see Lot-Sizing Procedures.

For materials with segmentation, requirement to stock conversion depends on the settings you have defined in the Requirement to Stock Conversion table in Customizing for Define Segmentation Strategies under  Logistics – General Segmentation . The system determines the stock segment to be procured.

Determine Procurement Proposal

Procurement proposals, for example, purchase requisitions are used to procure the shortage quantities. Procurement proposals are internal planning elements that can be changed, rescheduled, or deleted at any time. For more information about the determination of procurement proposal in the standard ERP system, see Procurement Proposal (PP-MRP-PP).

During a stock transfer between plants, if the supplying plant is not relevant for segmentation and the receiving plant is relevant for segmentation, the system determines the requirement segment according to the settings you have defined in the Customizing activity Purchase Requisitions under  Logistics – General Segmentation Define Requirement Segment for Supplying Plants .