A Document such as a credit note or an invoice correction can refer to one or more initial or preceding invoices. You can specify the invoice number and issue date.

This can also be used for debit notes and other invoice like messages which make references to preceding invoices.

Use the BillingReference element to model this information.

Elements

Element	Description
`Invoice/BillingReference/InvoiceDocumentReference/ID`	Specify the number of the referenced document.
`Invoice/BillingReference/InvoiceDocumentReference/IssueDate`	The date the reference Document was issued.

Example

<Invoice>
    <!-- code omitted for clarity -->
    <cac:BillingReference>
        <cac:InvoiceDocumentReference>
            <cbc:ID>INV-99887766</cbc:ID>
            <cbc:IssueDate>2024-09-30</cbc:IssueDate>
        </cac:InvoiceDocumentReference>
    </cac:BillingReference>
    <!-- code omitted for clarity -->
</Invoice>