def set_as_opus_maximum(self):  # TODO: test
        """Mark explicitly the work as the author's opus maximum."""
        if self.is_opus_maximum():
            return False
        else:
            opmax = self._get_opus_maximum()
            self.ecrm_P2_has_type = opmax
            self.update()
            return True
Mark explicitly the work as the author's opus maximum.