Problem: You are trying to ensure that shipping discount rules remain active across all frontend languages in WPML. The discount rule works perfectly in the Dutch version of your webshop, but when the checkout page is translated (e.g., to French), the rule is no longer applied. Solution: We recommend checking the known issue related to shipping methods not appearing on translated cart pages at https://wpml.org/errata/flexible-shipping-pro-shipping-methods-do-not-appear-on-translated-cart/. Additionally, ensure that you have updated your WPML plugins to the latest version to avoid any conflicts or incompatibilities. It is crucial to take a full backup of your website and database before making changes. We also advise trying these steps on a staging or development site first to protect your live website.
If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML support forum.