As a consultant you you should consult your business, if you can't then you should take a training to become a better support for your business.
From my point of view does this requirement contradict the logic of ATP. Just assume you have 100 on stock when the order arrives on day one. You need 10 days to replenish the stock. While customer A was so kind to order that much in advance you decide to deliver the goods to customer B, 3 days before the delivery date you run ATP, and Oops nothing there. What are you going to tell this customer? Probably not "You have to order earlier to get the material on time" .
ATP is not just a function, it is a process and a philosophy and there are books on ATP if a course is too expensive (probably less expensive than losing a customer)
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