[firebird-support] Numeration without hole, Is right Before Insert Trigger?

Hello,
I must assign a serial number, without hole, in a column of a fiscal
document.
I must assign the number only when I know if the document is complete
and I think the right moment is on a Before Insert Trigger for the table.

Is right or the insertion can fail? If not right, when I must assign the
number to be sure of not have a hole in numeration?

Thanks
--

Luigi Siciliano
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