Compiere erp software comes with tested and stable Core Classes and if we intend to make changes on Compiere Core Model Objects, then please know that we're drifting the software into dark murky waters.
The Demand Planning main purpose is to identify "how Materials are moving (Fast, Slow & Non Moving)" and based on these details
One of the most common data entry errors are duplicate orders. Often users enter same Orders multiple times in the ERP system
Material Policy defines the movement of goods from the warehouse. In the warehouse, products are arranged in lots.