An XX Order line is generated when we receive a part number from the DMS which is on the same order multiple times for multiple customers or is a part with a pack quantity where some of the pack is for a customer and the rest is for stock. When this situation occurs, you will see multiple lines in your reports for that part number as shown below:
When scanning this part in, the scanner will display multiple orders that need to be filled for that part number and will show the XX lines separately. This means that the part must be scanned multiple times and the quantity for that particular line must be entered each time.
If only a single part is scanned in, the part that was scanned will not receive until the rest of the lines on that order are also handled. This is what you will see on your Not Posted report when only part of the XX order has been scanned:
In this situation, either the part needs to be scanned again (if both of the items have actually arrived and need to be received) OR you can right click on the part and choose to backorder remaining (if the part hasn't shown up yet and still needs to be on order), cancel remaining (if the one that showed up is the only one that will arrive and the other has been cancelled), or receive remaining (if both parts have arrived and need to be received and it was only scanned once in error).