Unifaun - Declaration value before discounts

functions.php

<?php
/**
 * @snippet       WooCommerce -Unifaun - Set Customs Line Value
 * @author        Redlight Media AB / Christopher Hedqvist
 * @compatible    WooCommerce 3.9.0
 */
function redlight_unifaun_customs_line_value( $line, $shipment, $order, $product, $item ) {
    $line['value'] = $item->get_subtotal() - $item->get_subtotal_tax();
    return $line;
}
add_filter('ac_wc_unifaun_shipment_customs_declaration_line', 'redlight_unifaun_customs_line_value', 10, 5 );