You can reference the ID of the receipt advice and add the date it was issued as well.

Use the ReceiptDocumentReference element to model this information.

Elements

Element	Description
`/Invoice/ReceiptDocumentReference/ID`	The ID of the receipt advice.
`/Invoice/ReceiptDocumentReference/IssueDate`	The date that the receipt advice was issued.

Example

<Invoice>
    <!-- code omitted for clarity -->
    <cac:ReceiptDocumentReference>
        <cbc:ID>RA-11223344</cbc:ID>
        <cbc:IssueDate>2024-08-29</cbc:IssueDate>
    </cac:ReceiptDocumentReference>    
    <!-- code omitted for clarity -->
</Invoice>