Net Requirements Calculation for Forecast-Based Planning 
Net Requirements Calculation for Forecast-Based Planning
Use
The basis of forecast-based planning is the forecast of the total requirements. The system only considers the forecast requirement quantities as issues. Other issue elements, such as, customer requirements, planned independent requirements, or reservations are only displayed and are not included in the net requirements calculation. The system checks every forecast requirement to determine whether it is covered by available warehouse stock and/or receipts (purchase orders, firmed procurement proposals).
Prerequisites
You have set an MRP type for the material in the MRP Type field in the material master (View MRP 1) to forecast-based planning.
Features
Available stock is calculated as follows:
A shortage occurs if available stock is negative, that is, the requirements quantity is greater than expected receipts.
The system specifies the forecast requirements date as the requirements date. In this case, it assumes that forecast requirements are needed at the beginning of the period. This means that the requirements date is the first workday of the respective period.
If the requirements of a particular period are not to be set on the first workday, but are to be evenly distributed over the period instead, select the splitting function of the forecast requirements (see Define Splitting of Forecast Requirements for MRP in the documentation for Consumption-Based Planning.