Host variable <str> is ambiguous in the host file

  Explanation:  The ANSI and ISO SQL standards require that host
  variable names be unique in the entire file being preprocessed.
  The SQL interface to Oracle Rdb only requires it to be unique in
  its language scope.  This host variable is not unique in the
  file.

  User Action:  If it is important to have only standard features
  in your program, you should change the name of this host
  variable to make it unique in the file.