def METHOD_NAME(self, org_id, filename):
    """
    Export the etree to a file.
    :param org: String of Organisation id
    :param filename: String of the file name
    :return: File path
    """
    dir_path = f"db/org/{org_id}/iati/"
    return save_iati_xml(dir_path, filename, self.iati_activities)