@utilities.arguments_not_none<EOL><INDENT>def remove_child_objectives(self, objective_id):<DEDENT>
<EOL>return self._hierarchy_session.remove_children(id_=objective_id)<EOL>
Removes all children from an objective.

        arg:    objective_id (osid.id.Id): the ``Id`` of an objective
        raise:  NotFound - ``objective_id`` not found
        raise:  NullArgument - ``objective_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*