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The table name was correct, I just hid it in my screenshot.
The columns names are not the same on both side of the output tool, so I understand this is the cause of the issue. It somehow doesn't make sense because I'd use the manual mapping option specifically when the name are different (if they are identical the 'Map by name' option is sufficient). Or am I missing the point?
I tried pushing data into an empty table in Vertica DB and saw that the custom mapping function is available irrespective of the destination field names.
I would suggest you try installing the ODBC driver again or try pushing the data into another table. This error can also occur due to an older version of Alteryx. You can also try installing the newer version.