Duilio,
the one thing that bothers me is that you want to do DDL from within your
application. Unlike Helen, I cannot say exactly why, but it does ring a
warning bell.

The one article that I think may get you on a better track is "An Auditable
Series of Numbers" found on
http://www.ibobjects.com/docs/ti_AuditableSeries.ZIP

Regardless of whether this helps or not, I hope you find a good solution to
your problem.

Set