Maybe you found a mistake in your application and impacted to the duplicate key found in file that you don't need.
Now what? Here is a short command in SQL that will delete duplicate keys. In this example, FILEA = File name, LIBA=Library name, and INVNO=key field.
DELETE FROM LIBA/FILEA F1 WHERE RRN(F1) > (select MIN(RRN(F2)) FROM FILEA F2 WHERE F2.INVNO=F1.INVNO)
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