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

Elements

Element	Description
`Invoice/InvoiceLine/LineExtensionAmount`	Specify the net amount for this line.
`Invoice/InvoiceLine/LineExtensionAmount @currencyID`	Ensure that this matches the Document Currency.

Example

<Invoice>
    <!-- code omitted for clarity -->
    <cac:InvoiceLine>
        <!-- code omitted for clarity -->
        <cbc:LineExtensionAmount currencyID="EUR">1399.99</cbc:LineExtensionAmount>
        <!-- code omitted for clarity -->
    </cac:InvoiceLine>
</Invoice>