Use the ID sub-element of the AdditionalDocumentReference element to specify this value., You can also specify a date of issues for the referenced e-invoice.

Elements

These elements are indicated on invoices issued by transportation companies to certify ancillary transactions.

Element	Description
`Invoice/BillingReference/AdditionalDocumentReference/ID`	Specify the e-invoice number.
`Invoice/BillingReference/AdditionalDocumentReference/ID[schemeID="VRBL:IT:ZZZ"]`	Use `VRBL:IT:ZZZ` as the `@schemeID` value,
`Invoice/BillingReference/AdditionalDocumentReference/IssueDate`	Specify the date the referenced e-invoice was issued.

Example

The following example specifies MAININV1111 as the referenced e-invoice for transportation:


<ubl:Invoice>
    <cac:BillingReference>
        <!-- Code omitted for clarity -->
        <cac:AdditionalDocumentReference>
            <!-- Code omitted for clarity -->
            <cbc:ID schemeID="VRBL:IT:ZZZ">MAININV1111</cbc:ID>
            <cbc:IssueDate>2024-06-10</cbc:IssueDate>
            <!-- Code omitted for clarity -->
        </cac:AdditionalDocumentReference>
    </cac:BillingReference>
</ubl:Invoice>