Use the AdministrationReferenceCode (Extn) Extension to specify the Administration Reference number.

Italian Specification

Detail	Value
Italian Specification	`2.1.1.7.8 (RiferimentoAmministrazione)`

Elements

Use the following elements if the Tax Representative is an organization:

Element	Description
`Invoice/AllowanceCharge/AllowanceChargeReasonCode/`	Specify `VRBL:IT:ZZZ`.
`Invoice/AllowanceCharge/AllowanceChargeReasonCode/UBLExtensions/UBLExtension/ ExtensionContent/AllowanceChargeExtension/AdministrationReferenceCode`	Administration reference code.

Example

<ubl:Invoice>
    <!-- Code omitted for clarity -->
    <cac:AllowanceCharge>
        <cec:UBLExtensions>
            <cec:UBLExtension>
                <cec:ExtensionContent>
                    <vrbl:AllowanceChargeExtension>
                        <!-- Code omitted for clarity -->
                        <vrbl:AdministrationReferenceCode>admin ref code</vrbl:AdministrationReferenceCode>
                        <!-- Code omitted for clarity -->
                    </vrbl:AllowanceChargeExtension>                            
                </cec:ExtensionContent>
            </cec:UBLExtension>
        </cec:UBLExtensions>
    </cac:AllowanceCharge>
    <!-- Code omitted for clarity -->
</ubl:Invoice>