update would cause recursive execution of trigger <str>

  Explanation:  The trigger specified and  possibly  a  series  of
  other  triggers  have  been  defined  such that execution of the
  update operation which invokes the specified trigger will  cause
  that trigger to be recursively invoked.

  User Action:  First, review  the  database  design  and  defined
  triggers;  then,  redefine  one  or  more  of  the  triggers  to
  eliminate the possibility of recursive invocation.