Hi Roberto,
Here is the setup of Item:
Manufacturing Policy: Make-to-Stock
Reordering Policy: Lot-for-Lot
Include Inventory: on
Reserve: Optional
Order Tracking Policy: None
For example, Item A is requested by a sales order that has shipment date 11/25/13. After "Calculate Regenerative Plan", planning worksheets says Attention: The Starting Date 11/15/13 is before the work date 11/22/13. We accept action message and released Prod Order RP-100123 for Item A. If we rerun "Calculate Regenerative Plan", planning worksheets will say cancel RP-100123 and create a new Prod Order for Item A.
Let me know if you need more info. Thank you.