Purchase Order Name Uniqueness

"We have noticed that the purchase orders are unique by name for example ""PO1234"" However we have multiple suppliers that may have the same PO name. For example: Supplier A delivers a box with PO1234 Supplier B delivers a box with PO1234 These are two unique POs. DC prevents creating a PO with the same PO number. We would like the uniqueness in your system to be a combined key of supplier ID and PO name."