Backorder Splitter

The backorder addition is an amazing feature, thank you. There are a couple of issues I am coming across though.

1) It isn’t separating the orders correctly. When an order is placed, the item is in stock, and the quantity ordered is less than the quantity in stock, everything work fine. However, when an item is ordered and more is ordered than what is in stock, the order is splitting incorrectly.

1a) If some of the order can be filled, then the order is split 3 times. The first time is splits is when the order page loads. One order is blank while the other has all the items and their total quantity. The original order is removed. When the page is reloaded (without doing anything else), another order is made but is blank. There should only be a total of two orders; one with the items and their in stock quantities and one with the items and their backorder quantities. The totals should update to reflect this.

1b) If an order only has items that are entirely backorders, then the order is split 2 times. One order is blank while the other has the items and their quantities. The order that is blank has the total of the order which matches the total of the backorder order. The blank order is not needed.

2) The in stock quantities are not managed correctly when an order is split. Every time an order is split, the stock quantity is decremented. For example, when I place an order that has an item a quantity (let us say 5) greater than what is in stock (let us say 2) and the order splits, the in stock quantity is decremented 15. 5 is decremented when the order is placed, 5 is decremented when the order is split, and 5 is decremented when the order is split again (issue 1a).

I really appreciate your help with this.