ORA-00904: invalid column name

[gandolf989]

Does this query show your column name?
Do you have any miscellaneous characters around the new column name?
Post the results of this query.

SELECT table_name, '|' || column_name || '|', data_type
  FROM all_tab_columns
 WHERE owner      = 'SCHEMAOWNER'    AND
       table_name = 'YOURTABLE_NAME'
 ORDER BY column_id;