Hi,
you can address this using vendor consignment.. create vendor master and create consignment info record.. create consignment PO and do GR. then the stock will come under consignment stock. Reverse the entry or do 102K while returning. the loan amount has to be settled in FB60. if you arr buying the material later, take it into own stock and do settlement in MRKO. hope you know the consignment prossess.
Regards,
Sudeep