Hi. From what I understand in the l-coin store the daily limits of the product are based on the quantity sold. That is, player x can buy n items per day.
It seems to me that the server considers the daily limit of purchases and not the quantity.
So the item:
<production id="94691" accountDailyLimit="3" /> <!-- Package: Scroll: Boost Defense (10 pcs.) -->
Can be purchased 3 times a day regardless of quantity.
But the client in turn seems to consider the quantity. That is, the player could make n purchases as long as they did not exceed the amount of 3 items purchased.