The system allows to make items with default order type PUR to be phantoms. The slider on the item does let you say "YES" to phantom and the line type on the BOM line lets you make it Phantom for a purchased part . No warning. but serious MRP consequences. MRP will not recognize existing Purchase orders for a so called purchased phantom and will create a new planned PO but that planned PO will say "Directly derived" because it is for a phantom and you won't be able to firm it. Purchased phantoms should be made impossible as the concept makes no sense. the user should be protected against making this mistake