For EN-1693, you can use the @schemeID attribute of the ID subelement of the AdditionalDocumentReference element to specify the type of document that is being referenced.

More information about additional document references is provided in the Additional Document Reference (URI) topic.

Elements

Element	Description
`Invoice/AdditionalDocumentReference/ID`	Specify the ID of the referenced Document.
`Invoice/AdditionalDocumentReference/ID @schemeID`	Specify the type of the referenced document.
`Invoice/AdditionalDocumentReference/DocumentTypeCode`	Specify `130` for invoices.

Restrictions

You must use one of the values from the UNTDID 1153 list here for the @schemeID attribute.

Example

<Invoice>
    <!-- code omitted for clarity -->
    <cac:AdditionalDocumentReference>
        <!-- AAE = Goods Declaration Number -->
        <cbc:ID schemeID="AAE">GDN-TT33226655</cbc:ID>
        <!--  fixed value 130 -->
        <cbc:DocumentTypeCode>130<cbc:DocumentTypeCode>
    </cac:AdditionalDocumentReference>    
    <!-- code omitted for clarity -->
</Invoice>