docs: def assign_objective_to_objective_bank(self, objective_id, objective_bank_id):
          """Adds an existing ``Objective`` to an ``ObjectiveBank``.
  
          arg:    objective_id (osid.id.Id): the ``Id`` of the
                  ``Objective``
          arg:    objective_bank_id (osid.id.Id): the ``Id`` of the
                  ``ObjectiveBank``
          raise:  AlreadyExists - ``objective_id`` already mapped to
                  ``objective_bank_id``
          raise:  NotFound - ``objective_id`` or ``objective_bank_id`` not
                  found
          raise:  NullArgument - ``objective_id`` or ``objective_bank_id``
                  is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.resource.ResourceBinAssignmentSession.assign_resource_to_bin
          mgr = self._get_provider_manager('LEARNING', local=True)
          lookup_session = mgr.get_objective_bank_lookup_session(proxy=self._proxy)
          lookup_session.get_objective_bank(objective_bank_id)  # to raise NotFound
          self._assign_object_to_catalog(objective_id, objective_bank_id)