Ok, hope I can explain the problem correctly.
I have an infopath form connected to an SQL database.
The form shows a list of records from a database table, I can see every
record and MODIFY it.
I have added a send button that should update the records in the db
table but when I click on it Infopath tell me that it can't send the
form because there are not any new record to add. Yes, I don't have to
add a new record in the SQL table but simply UPDATE that table!
What I have to do?

Many thanks and sorry for my bad english.

Gabriele Fabbri.