Thank you for posting. We are having the same problem. We are a non-profit and occasionally have 24-hour sale events, where lots of purchases are made in just a few hours. Some of our items have low stock to start. At the end of a recent sale event, we had 4 different items that were oversold; i.e. stock quantities went negative.
We are trying to understand the circumstances when this can actually happen because the system works as expected sometimes and then doesn't work other times. This is not a new problem and has occurred throughout the year we have been using the system.
As you might expect, normally for items with low stock, when customers have placed the same item in their shopping carts, the first customer to complete a check out gets the item and the inventory stock is reduced, but another customer checking out later may get a message indicating the item is no longer available and it has been removed from their cart. This is what we would expect to happen. But with the current "bug", there are times when purchases of the same stock are still getting through. Below is an example of the transactions for one of these oversold items. The actual check-out times are a few minutes apart, so you would expect that the system already knows of the previous purchases by the time the oversell occurs.
Any suggestions of how to overcome this issue are appreciated. We will be reporting the issue to "support" as we have done in the past, but this is a pretty fundamental requirement to consider in selecting a system.
