routine "<str>" is referenced in  COMPUTED  BY  field  <str>  in
  relation <str>

  Explanation:  An attempted was made to delete a routine but  the
  routine is used in a COMPUTED BY field of a relation.

  User Action:   First,  review  the  database  design;  then,  if
  desired,  delete  the  COMPUTED  BY  field,  and then delete the
  routine.