Use the AdditionalDocumentReference element to model the details.

Elements

Element	Description
`Invoice/AdditionalDocumentReference/ID`	Identifier of the document entry registration process (ATCUD)
`Invoice/AdditionalDocumentReference/ID[@schemeID='ANG']`	Specify `ANG`
`Invoice/AdditionalDocumentReference/DocumentDescription`	Specify `QR_CODE`.
`Invoice/AdditionalDocumentReference/Attachment/EmbeddedDocumentBinaryObject`	The attached document in binary format (QR Code in base64).
`Invoice/AdditionalDocumentReference/Attachment/EmbeddedDocumentBinaryObject[mimecode]`	Specify `text/plain`
`Invoice/AdditionalDocumentReference/Attachment/EmbeddedDocumentBinaryObject[filename]`	Specify the file's name.

Restrictions

For Portuguese B2G documents, you must attach a QR code.

Example

    <!-- Code omitted for clarity -->
    <cac:AdditionalDocumentReference>
        <cbc:ID schemeID="ANG">12345678-241231231231</cbc:ID>
        <cbc:DocumentDescription>QR_CODE</cbc:DocumentDescription>
        <cac:Attachment>
            <cbc:EmbeddedDocumentBinaryObject mimeCode="text/plain" filename="file_name">JVBERi0xLjMNC...</cbc:EmbeddedDocumentBinaryObject>
        </cac:Attachment>
    </cac:AdditionalDocumentReference>
     <!-- Code omitted for clarity -->
</ubl:Invoice>