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Scenario 1: If a shopper books the last remaining slot in inventory when only 1 slot remains for an inventory group for the selected date, checks out, and returns to the shop to buy that product for the same date again before the order is processed and the lock expires, the shopper might see that date/slot as available and add it to cart, but be unable to check out with that product, if the lock has expired by the time he attempts to complete the order.
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