Is the problem that the LNAB field is pre-filling with Uribe Gracia? If this is so, you can simply change the surname to Uribe Urizar when you are entering your information. Whenever you are entering a father or children, the surname field pre-fills, but you can change it when needed.
If that is not the problem, then I would need more information because otherwise I do not know just what the conflict is.
