Namespace
cac urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2
Child elements
Card Name Description
1..1 cbc:ID

Purchase order reference
An identifier of a referenced purchase order, issued by the Buyer. An invoice must have buyer reference (BT-10) or purchase order reference. In cases where sales order reference is provided, but there's no purchase order reference, then use value "NA" as this element is mandatory in UBL.

Example value: 98776

0..1 cbc:SalesOrderID

Sales order reference
An identifier of a referenced sales order, issued by the Seller. In cases where sales order reference is provided, but there's no purchase order reference, then set cac:OrderReference/cbc:ID to value "NA" as this element is mandatory in UBL.

Example value: 112233