Calculating Net Requirements for Forecast-Based Planning

In forecast-based planning, the system only treats forecast requirement quantities required as issues. Other issue elements such as sales orders or reservations, for example, are only displayed in forecast-based planning 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, fixed purchase order proposals). Available stock is calculated as follows:

Warehouse stock

Safety stock

Receipts

(purchase orders, fixed order proposals)

Total requirements (forecast requirements)

A shortage occurs if available stock is negative, that means that total requirements are greater than the receipt quantity. The system stores the shortage quantity. The system takes the forecast requirement date as the requirement date. In this case, the system takes for granted that the forecast requirement arises at the beginning of the period. This means that the requirements date is the first workday of the respective period.

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