Well, ATP is like a traffic light in Mumbay. It is more a suggested directive than an enforced demand. You can use ATP to calculate delivery dates, but it's not intended to block sales. When there is no expected movement within the ATP window, then it defaults to the last day of the ATP time fence (or the first one after it, not sure). That's why it is important to set the ATP window in accordance with your lead times.
The calculated ATP qty should be 0, but this is only reflected in the (temporary) ATP table, not on your order line.
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RE: ATP does not take into account reserved stock
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