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Hi A R,
We will suggest to copy odbc.ini file from previous version and make changes in the file to reflect new folder location as recommended in Upgrade guide if you have many sources (DSNs) in odbc.ini.
If you have very less DSNs created in your previous odbc.ini file, you can also use new odbc.ini from upgraded version and add DSN entries from old odbc.ini to new odbc.ini
Regarding Reference Data Warehouse section, you can add that DSN from old odbc.ini to new upgraded odbc.ini.
Please let me know if this helps you.