Create a backordered item tracking system. Example: wer know we're going to be short a piece on a specific order. We drill down into that order. We select the backordered item and input an expected completion date. Backorder is reflected on packing materials (customer knows they did not receive and when they should expect to receive). A "backorder report" is available letting us know what we're missing and what order it matches up with. When complete we have the ability to mark it so.