When manually purchasing items from the Purchase Order screen, it is impossible to order one size from one vendor and another size from another vendor. For example, S&S is out of Ash in Mediums but have everything else. So you buy the mediums from SanMar. In order to split the purchase you have to go back and separate the line items. This is a pain, especially right now when inventory is so chaotic at the vendors. The whole purchase order screen is AWFUL!