You specify the main URL as the search engine could have trouble pinpointing which one should be the first URL.  The following tutorial will show you the way to help Canonical URLs in Prestashop 1.5. En muchas ocasiones, en las tiendas on the net se generan URLs que expresan https://bookmarkingace.com/story18764981/the-single-best-strategy-to-use-for-etiquetas-autom%C3%A1ticas-hreflang-canonical-etiquetas-seo