To reproduce : - set up Koha so that you create items when placing the order - create an order in a basket - modify the quantity to add more items to this order - if you click save, you will have an error message - if you press enter, the modifications will be saved, but you won't have entered any details about the added items. Ideally, when modifying the order (and when your system is set up so that items get created when you place the order), we should see the same table that displays with items when creating the order, with links to delete them. Deleting an item here should also delete the item in the catalog (right now we are prompted to do this manually). Adding items here should happen in the same way as when creating a new line.