function or procedure <str> already exists in this schema or
  database

  Explanation:  The specified function or procedure already exists
  in the specified database.  This could be caused by another
  procedure or an external function with the same name.  Remember
  that procedure names are scoped to the schema not the module.

  User Action:  Check the spelling of the function or procedure
  name and ensure that it is a unique function or procedure in the
  specified database.