manage_studies.yaml

            /do(
              $version := @study[$study].config_version.id(),
              $p_id := merge(participant_group {
                study_version := $version,
                code := if_null($participant_group, 'all-participants')
              }),
              $t_id := merge(time_period := {
                study_version := $version,
                code := if_null($time_period, 'anytime'),
                title := if_null(title, 'Anytime')
              }),
              $id := merge(requirement_list := {
                study_version := $version,
                participant_group := $p_id,
                time_period := $t_id
              }),
              {id := $id}
            )