Quote Originally Posted by si_the_geek
Do you mean that you have two or more completely identical rows in your database table, and you only want to edit one of them?

If so, that isn't really possible, and is a sign of bad database design.. the best you can do is modify the table so that it has a unique key, or move the data around around a bit to eliminate duplicates. Neither of these are options to be used in your program, they are both manual changes to the database itself.
Well the problem is that the row that i want to duplicate is called a document and is going to transform it to other tipe of documento.
SO i have for example a document like:
|Doc1|tipe1|

and i want to make a copy like:
|Doc1|tipe2|