(I have run into a bug, but I am using a *very* old version of this add-on, and do not know if this has been addressed already or not) What happened to me was: a customer placed an order. One item was out of stock, and we put it on backorder. The customer turned around and placed a second order for the same item. When the product was back in stock, and it came time to ship these, I put both orders together. I entered the order as two line items ... one line for the original (backordered) pu