>>Bear in mind that the DELETED() status has nothing to do with the uniqueness of a candidate or primary index. In any incremental key situation, you have to search all your table whether or not the records have been deleted.
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>PMFJI but in addition, even if you should check the deleted records, a simulataneous add by two users will also give the same behavior.

I agree. Tying this into an earlier thread about unique keys, I don't even try to use sequential numbers unless forced to. I like to use GUIDs as primary (unique) keys.