Normally this error comes when there are duplicate keys in a table.
Additionally, I had a call with one of the friends who was working on IN Upgrade. We found out that direct upgrade to BC 23 is not possible due to India localization. He upgraded to BC 22 and then upgraded to BC 23.
** Remember in BC23 Microsoft consolidated multiple table extension to one SQL table. It seems IN localization is not written in same way.
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