In the ERP, a separate window to create purchase order for component or sub-assembly or brought out items. The price must be entered before for these items by authorised user, so that the price control will be with one person who send RFQ to supplier and get the price for the parts. Here as well, without WO, cannot create such PO, so must come from flow. For BOI, ERP has two options like, Commercial BOI and Source control BOI