Interbase to MSSQL ETL PK violation with no constraint on destination table

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Using SSIS to move data from Interbase to SQL. Originating table in Interbase has a Primary Key, but I did not put the PK on the destination table (for the record: PK is an int, and is unique in the table)

When I attempt to run the package, it fails with a message about violating the PK constraint... which makes no sense to me when the destination table has neither PK nor identity.

I am using an ODBC connection, ado .net source with oledb destination.

Anyone encountered this before?

Thanks!

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