This issue has been discussed a lot of times and some users have posted solutions but they have apparently not worked for everybody. In any case it's a language/locale problem. Have a look at these:
Thank you mishmumken,
I found this Partially solutions for this problem, I think is a apple Bug, I wait for any fix:
Solution for Studio 2 AND Studio 3:
1) Each time you start your computer, go to System Settings - International
2) Change the language from your language to English
3) Change the language from English to your language
4) Start FCP
5) Your shortcuts and the FCP shortcuts work OK
You have to do this each time you restart the computer. People working with the English language setting don't have this problem.
This bug is about 2 years old. Shame on Apple for not solving the problem!!!