I should mention this is when creating new items then going into the Reorder screen to change the reorder method to None. Of course the item doesn't exist in IM_ItemWarehouse until he goes into the Reorder screen. If you change it to None, the warehouse record isn't created but if you leave it at Economic (default?), when you save it, you will see the warehouse in the warehouse panel at the bottom of the Main tab. Go back in and change it to None and the warehouse record disappears. (This is what I experienced, at least, not him.)