Entries and new terms not saved in a multiterm

Good morning,

I am working in a multiterm and trying to update it with new items. 

The problem is that each time that I try to insert a new term, after having written it when trying to save it on the bottom appear a red window: "si sono verificati uno o più errori. Annulla".

This way, I can't entry any new term because they're not saved...

Can you help me to understand why I have this problem and to solve it?

Have I to update Trados and Multiterm with the last version? I'm afraid that downloading the last versions then I can't view or edit the previous Multiterms.

I have Tradoa and Multiterm 2022.

Thank you for your help!

Maria

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