Quote Originally Posted by Djblois
Anybody Know what this message means and how do I prevent it from happening?

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The error message is from the Oracle ODBC. It is telling you that the Oracle table involved has a unique key constraint (NO DUPLICATES) has been violated (YOU HAVE a DUPLICATE).

To resolve the duplicate you have to do a check within your program that,
if the value you are trying to add already exists, then you must not try to add that record/value.

In Access you should look at the DCount function. Other approaches may also be used.