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Duplicate Records

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I have a simple database that we track deductions. Each of the deductions that we log in to the database has a unique transaction ID that we get from our customers (we key this number in manually). Sometimes they send us the same deductions (sometimes months later). Now to my question.

Is there some way to know when we put the transaction number in that a message or something will tell us that the transaction was already put in.

Thanks for your help

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why not do a little search on the forums for "duplicate records" ?

this will come up with about a 1000 threads about that subject.

- have a look at field validation (Unique value) in define fields

- do your validation formula yourself based on a self-join

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