As this Community Forum member put it - I have copied and pasted from the Forum.
This has been listed before. On Premier 19 and for all previous versions for 20 years, when you converted a purchase order to a Bill, the backorders would auto populate.
e.g. if the purchase order had Qty 100 and only 25 were delivered and charged, 75 would auto populate in the backorder field. We now have to calculate the backorder quantity manually and type the figure in. This means that it takes a lot longer to process and invoice and errors are made.
It makes the system useless. I might as well use a spreadsheet.
I couldn't say it better myself. This is a very important feature for users of inventory and purchase orders and I have many clients I cannot upgrade to 2016 because of this very issue. They would throttle me and wonder why so many other time saving features have been added whilst a major time saving feature has been taken away.