Abstract: A supply chain management plan includes supply events for inventory and times at which the supplies will be received. The plan further includes demand events and when they occur. The demands may be prioritized. For each demand priority, an available to promise (ATP) amount of supply is determined in accordance with demand events of that priority. The ATP is determined for higher priority demand events before it is determined for lower priority demand events. Cancellations of a priority k order may be processed by determining, for each demand priority context i=k+1 to N, an amount of inventory to restore to available status at a particular supply event based upon a minimum ATPRG value between the particular supply event and the order committed date.

Abstract: An inventory supply management procedure involves representing inventory supply events in a data processing device memory with indications of times at which the supply events take place, and associating with each supply event at least an Available to Promise (ATP) and an ATP Restoration Guide (ATPRG) value.