index definition contains a redundant reference to a column

  Explanation:  The index definition repeated  a  reference  to  a
  column  in  a  table.  This usage is not needed and does not add
  any value to the index.

  User Action:  This is just a warning.  If you drop the index and
  recreate  it  without  the  redundant  column  reference it will
  occupy less space in the database.