associations - 関連のすべての要素を取得する方法は?

Question

次のように CDS ビューを作成しました。

define view YGAC_I_REQUEST_ROLE
  with parameters
    pm_req_id    : grfn_guid,
    @Consumption.defaultValue: 'ROL'
    pm_item_type : grac_prov_item_type,
    @Consumption.defaultValue: 'AP'
    pm_approval  : grac_approval_status
  as select from YGAC_I_REQ_PROVISION_ITEM as provitem

  association [1..1] to YGAC_I_ROLE as _Role on _Role.RoleId = provitem.ProvisionItemId

  association [1..*] to YGAC_I_ROLE_RS as _Relation on _Relation.RoleId1 = provitem.ProvisionItemId

{
  key ReqId,
  key ReqIdItem,
      Connector,
      ProvisionItemId,
      ActionType,
      ValidFrom,
      ValidTo,

      _Role.RoleId,
      _Role.RoleName,
      _Role.RoleType,


      _Role,
      _Relation
}
where
      ReqId             = $parameters.pm_req_id
  and ProvisionItemType = $parameters.pm_item_type
  and ApprovalStatus    = $parameters.pm_approval

次に、ABAP で消費しました。

  SELECT
    FROM ygac_i_request_role( pm_req_id = @lv_test,
                              pm_item_type = @lv_item_type,
                              pm_approval = @lv_approval
                            )
    FIELDS reqid,
           connector,
           provisionitemid
  INTO TABLE @DATA(lt_result).

_Relation上記の選択に従ってのリストを取得する方法。