no outer join has been formed -- outer join operator (+) ignored

  Explanation:  A column was marked with the outer join operator
  (+) and compared to a simple expression that doesn't contain
  another table and column reference.  Since no outer join has
  been formed between two tables Oracle Rdb will ignore the outer
  join notation.

  User Action:  If this Boolean expression appears before other
  AND comparisions then you should reorder the AND expressions so
  that comparisions with literal values and other simple
  expressions appear last.