<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_cumulative(self, cumulative):
 """Applies this rule to all previous assessment parts. arg: cumulative (boolean):
 ``true`` to apply to all previous assessment parts. ``false`` to apply to the immediate previous assessment part raise: InvalidArgument - ``cumulative`` is invalid raise: NoAccess - ``Metadata.isReadOnly()`` is ``true`` *compliance: mandatory -- This method must be implemented.* """

        # Implemented from template for osid.resource.ResourceForm.set_group_template
        if self.get_cumulative_metadata().is_read_only():
            raise errors.NoAccess()
        if not self._is_valid_boolean(cumulative):
            raise errors.InvalidArgument()
        self._my_map['cumulative'] = cumulative