I have imported the products with the "Import" native function of Prestashop.
Than I imported the combinations, and it works for most products.
The problem now is that I can't delete combinations in back office. Why?
Prestashop version: 1.7.4.3
Informazioni sul server Linux #1 SMP Thu Jan 25 20:13:58 UTC 2018 x86_64
Versione software del server: CentOS WebPanel: Protected by Mod Security
Versione di PHP: 7.2.1