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1..1
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cbc:ID
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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
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0..1
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cbc:SalesOrderID
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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
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