Net Requirements Calculation
Use
The system uses the net requirements calculation to determine uncovered product requirements during procurement planning for a location product. To do this, the system has the product requirements consume the product stock and the existing PP/DS and SNP product receipts.
Most procurement planning heuristics use the
standard net requirements calculation
, which has requirements consume fixed receipts. The standard heuristic SAP_PP_003 for
Planning shortage quantities
(algorithm /SAPAPO/HEU_PLAN_DEFICITS) and the
actions
, which should cover new or changed dependent requirements immediately, use one
of the variants that differs from the standard net requirements calculation
. For this variant, if required, the system also includes unfixed receipts in the consumption process in addition to the fixed receipts.
The net requirements calculation is the first step that the system executes during procurement planning for a product. To cover the identified shortage quantities, the system tries to create receipts after the net requirements calculation.
Features
Relevant Requirements, Stock, and Receipts
The net requirements calculation takes account of all product requirements, stock, and receipts in the planning period that are relevant for pegging and that lie in the same pegging area (planning segment). Therefore, the net requirements calculation is not specific to a storage location or batch. The requirements include sales orders or planned independent requirements, for example. The stock includes the unrestricted-use stock, for example. Orders for in-house production (such as planned orders) or for external procurement (such as purchase orders) create receipts for the order product. The net requirements calculation takes account of the pegging-relevant quantity of requirements, stock, and receipts.
Offsetting Procedure
The offsetting procedure determines the time sequence in which the net requirements calculation processes requirements and stock and uses receipts. The net requirements calculation always starts with the earliest requirements and has them consume the earliest stock and fixed receipts.
The requirement dates/times of the requirements and the availability dates/times of the stock and receipts are relevant for the net requirements calculation. With the exception of batches, the requirements date/time of stock is 1/1/1970 for the net requirements calculation. The net requirements calculation consumes this stock first. After this, it uses batches and receipts in the time sequence of the availability dates/times.
Fixed Receipts
Receipts with the status PP firmed are regarded as fixed for the net requirements calculation. The fixed receipts include the receipts of the following orders:
Planned orders and purchase requisitions whose availability date/time is within the planning time fence
Planned orders and purchase requisitions that you have created or processed manually
Purchase orders and manufacturing orders
Supply Network Planning
(SNP) receipts that lie after the PP/DS horizon are also fixed for PP/DS. The offsetting procedure determines how the net requirements calculation takes account of fixed SNP orders.
Safety Time
In the net requirements calculation, procurement planning heuristics take account of the safety time .
Net Requirements Calculation in Characteristics-Dependent Planning (CDP)
The characteristic requirement of the requirement and the characteristic value assignment of the receipt must be compatible to allow the net requirements calculation to have a requirement consume a receipt. For more information, see Offsetting Procedure
Shelf Life Data
The standard net requirements calculation can take the shelf life data for requirements and receipts into consideration during consumption. For more information, see Planning with Shelf Life Data in PP/DS .