[Resolved] Variation_id changed with update

Hi Itamar,

I handled it myself by adding following code to my functions.php.

/* AFTER UPDATE: VARIATION ID DIFFERENT FOR ALL LANGUAGES - CHANGE BACK TO DEFAULT LANGUAGE VARIATION_ID IN ALL LANGUAGES */
add_filter('woocommerce_rest_prepare_shop_order_object', 'force_variation_ids_to_default_language', 10, 3);
function force_variation_ids_to_default_language($response, $order, $request) {
if (!is_a($order, 'WC_Order')) return $response;

// Haal de default taal van WPML
$default_lang = function_exists('wpml_get_default_language') ? wpml_get_default_language() : 'nl';

// Haal de taal waarin deze bestelling is geplaatst
$order_lang = $order->get_meta('wpml_language');

// Alleen aanpassen als de order NIET in de default taal is
if ($order_lang && $order_lang !== $default_lang) {
foreach ($response->data['line_items'] as $index => $item) {
// === Fix variation_id ===
if (!empty($item['variation_id'])) {
$current_variation_id = $item['variation_id'];

// Zet deze variation ID om naar de default taal
$default_variation_id = apply_filters(
'wpml_object_id',
$current_variation_id,
'product_variation',
false,
$default_lang
);

if ($default_variation_id) {
$response->data['line_items'][$index]['variation_id'] = (int) $default_variation_id;
}
}

// === Fix product_id ===
if (!empty($item['product_id'])) {
$current_product_id = $item['product_id'];

$default_product_id = apply_filters(
'wpml_object_id',
$current_product_id,
'product',
false,
$default_lang
);

if ($default_product_id) {
$response->data['line_items'][$index]['product_id'] = (int) $default_product_id;
}
}
}
}

return $response;
}