The Sales data like Orders, delivery and invoices is fed from the BW system to the APO system, this data is commonly termed as ‘History’ or ‘Actuals’.
Various processes and algorithms then modify the data in the APO system and generate forecast and plan data for a week or month.
This data is stored as weekly / monthly snapshot and transferred to the BW system. The users can then see a query in BW system comparing various plan snapshots against the actuals.
The demand planning is mainly done on the quantity of product at various levels like product group, product line or individual product.