Thanks guys for responding. This is a legacy app and I didn't want to change the "append blanks" to "inserts". The solution was to use a filter on the index. I have never before done that. Thanks.

>>i have a free standing table that i want to create a CANDIDATE index on to prevent dupes. here's the issue, the app requires a blank record. so how do i append a new record to this if i add the CANDIDATE index? i get "uniqueness violated" when i try to "Append blank" at this time.
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>>thnx
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>Perhaps there is already a blank record?
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>If you need several blank records, you can put a filter on the index, on not blank(MyField).
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>Also, you can avoid errors by either:
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>(1) Instead of:
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>append blank
>replace...
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>you can use a single command:
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>insert into MyTable (Field1, Fiel2) values (Value1, Value2)
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>Or, use buffering. In this case, the candidate index (and other restrictions, like triggers created through referential integrity) will only be checked when the record is saved with TableUpdate().