What Is Available-to-Promise?

ATP Available-to-Promise The portion of a company's inventory or planned production that has not yet been allocated to customer orders. This quantity is maintained in the master production plan as a basis for promising customer orders. The amount of ATP in the first time zone is the available inventory. It is calculated for each time zone that has an estimated receipt of the main production plan. The ATP in the first time zone is equal to the amount of existing inventory minus expired and expired customer orders. In any time zone that contains the main production plan receipt, ATP equals the main production plan amount minus the time zone, and after that time zone, all customer orders before the next time zone with the main production plan receipt. Negative ATP decreases ATP in the previous time zone.