[Andrea1998]

I would like to have more detailed information, how can I do?

You can't; it's just the classification.

ok thanks, I understand;
It's clearer now.

[Karellen]

Certification prefix: Rated

You should have Italy: instead, assuming that is what the skin uses.

Then you need to check the skin to ensure it uses the Italy: prefix. If not, you will need to add it as well as the certification icons to the xbt file.
See here as an example... https://github.com/mikesilvo164/Aeon-Nox....xml#L1039