[Chiuso] Problem importing new linguage

I would like to import a new language and translate products into Polish (PL), but it is not working correctly. The products are imported, but they are not linked to the corresponding Italian products.
- I have already translated all the taxonomies.
- I included the following fields in the CSV:
_wpml_import_translation_group
_wpml_import_language_code
_wpml_import_source_language_code
- I also used the same SKU as the Italian product.
However, when I run the import, a new _wpml_import_translation_group is automatically created instead of linking the product to the existing Italian one.
Additionally:
I have all the necessary plugins installed: WP All Import Pro, WooCommerce Add-On Pro, WPML Export and Import, and WP All Export.
I have tried importing both with WPML All Import enabled and without it.
When I finished the import I run WPML Import Export, it translate the category but not linked products to italian ones.
Could you please explain how I should proceed?