routine can not be invoked - it is marked invalid

  Explanation:  This routine can not  be  invoked.   It  has  been
  marked  invalid  as  a  result  of  a  data  definition language
  operation on an object upon which  this  routine  was  dependent
  (with language semantics dependency).

  User  Action:   Revalidate  the  procedure  by  recompiling  the
  procedure.   This  may  require  that you drop and re-create the
  routine or module.