When the discrete available-to-promise (ATP) method is used, the master production receipt quantity is committed...

The discrete available-to-promise (ATP) method is a calculation based on the available-to-promise figure in the master schedule. For the first period, the ATP is the sum of the beginning inventory plus the MPS quantity minus backlog for all periods until the item is master scheduled again. For other periods, the quantity that is available for an item is based on the quantity available within an individual purchase. Therefore, the master production receipt quantity is committed to requests only for shipment before the next MPS receipt12. References:

•1: APICS CPIM Part 2 Exam Content Manual, Version 8.0, p. 29

•2: NetSuite Applications Suite - Available to Promise Methods3