After the first period of the planning horizon,available-to-promise (ATP)inventory is computed only for those periods in which there is a planned production quantity.

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This is because the available-to-promise (ATP) inventory is calculated by subtracting the customer orders that have already been promised from the current available inventory. If there is no planned production quantity for a certain period, then there is no need to calculate the ATP inventory for that period since it will remain the same as the previous period.

After the First Period of the Planning Horizon,available-To-Promise (ATP)inventory Is