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Hi Jaap,
Thanks for your contact!
As a quick test, could you please try this:
- Resave your Settings -> Permalinks page
- Try to translate the product slug again (for instance, you can add an extra character to it, and then remove it)
Then check if the warning will disappear. Another option you can try is to delete the 'wpml_notices' register from your _options table in the database. Just make sure to have a complete backup before doing it.