This forces customers to go to the product's web site and decide on a combination, instead of only adding the default a single for the cart. Note that products without any combination will continue to have an "Insert to cart" button while in the category site. starts the setup. Beware https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/30904-automatische-hreflang-tags-und-kanonische-tags-seo.html