mareksZ

Problem:
If you're trying to translate a product using WPML and encounter an issue where automatic translation does not work for a specific product across all languages, and you receive a message stating 'you need to translate this post manually because the field groups attached to it use different translation options', this is likely due to your configuration settings.
Solution:
We recommend checking the configuration of your field groups. The warning appears because the field groups used by the product are set to 'Different fields across languages'. For more information on how to handle this, please visit: https://wpml.org/documentation/related-projects/translate-sites-built-with-acf/#choosing-how-to-translate-field-groups
You should change the settings for the entire field group used by the product in ACF → Field Groups. Select the Field Group and modify the settings accordingly.

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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 you still need assistance, please open a new support ticket at our support forum.