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Hi El Patron. Thank you for your very detailed answer. So. I have compared both products and realized that it was the column id_tax_rules_group. ERP sends value 1 for this column, but as I DON'T USE taxes rules and taxes in PRESTASHOP (the table tax_rules_group is empty), it should be 0. So, I recommend that even though, there is a value different of 0, prestashop needs to force an update to the tables: "product" and "product_shop" (that there is this "id_tax_rules_group" column) or ignore this value... maybe some kind of treatment. (check if user has turned off the "use taxes?" option on "Menu > International > Taxes" page, if OFF, ignore any id_tax_rules_group on those tables... something like that. Is it possible? So that it's a prestashop bug.
I updated both tables "product" and "product_shop", put 0 on id_tax_rules_group value. And tried to update the product on the admin panel of prestashop (edit product page), saved...and it worked!
