BTW the location is now disabled, before it was possible to change it item fulfilment. I am not sure if that hint on anything.

Thanks for helping, I attached all photos from accounting preference, order management, and company , new features, Inventory tab, plus one senario that fulfilment doesn't work. basically in attached SO, there are three items, the last item is spilitted to two line , because one is on hand and one is on back order, however…