Use the ItemClassificationCode subelement of the InvoiceLine element to model this information.

Elements

Element	Description
`Invoice/InvoiceLine/CommodityClassification/ItemClassificationCode`	A code for classifying the item.
`Invoice/InvoiceLine/CommodityClassification/ItemClassificationCode @listID`

Example

<Invoice>
    <!-- code omitted for clarity -->
    <cac:InvoiceLine>
        <!-- code omitted for clarity -->
        <cac:CommodityClassification>
            <cbc:ItemClassificationCode listID="STI">44331</cbc:ItemClassificationCode>
        </cac:CommodityClassification>
        <!-- code omitted for clarity -->
    </cac:InvoiceLine>
</Invoice>