>Because sometimes the user give up to include a record (revert) and that number of autoinc field is not used. It is not a problem, just a preference of user.

It is not possible why it is intrinsic in the mechanism.

The single way would be that one to admit a value null, but ill-fatedly the fields autoincrement of all the databases that I know do not admit value null (an error for me).

In order to resolve it you must create the records on a temporary cursor, and when the customer confirmation the writing, to copy it (without buffering) in the table.

Fabio