diff --git a/OpenAPI/TS28541_SliceNrm.yaml b/OpenAPI/TS28541_SliceNrm.yaml
index c1a64bfd8fa323efebd19ab499c8ba629e25fd76..2fe0726fd818218a095511ac7bbd2e37b17b61b7 100755
--- a/OpenAPI/TS28541_SliceNrm.yaml
+++ b/OpenAPI/TS28541_SliceNrm.yaml
@@ -765,7 +765,7 @@ components:
     RequestedReservationExpiration:
       description: >-
         An attribute which specifies MnS consuner's requirements for the validity period of the resource reservation.
-      type: string
+      $ref: 'TS28623_ComDefs.yaml#/components/schemas/TimeWindow'
     ResourceReservationStatus:
       description: >-
         An attribute which specifies the resource reservation result for the feasibility check job.
@@ -777,7 +777,7 @@ components:
     ReservationExpiration:
       description: >-
         An attribute which specifies the actual validity period of the resource reservation..
-      type: string
+      $ref: 'TS28623_ComDefs.yaml#/components/schemas/TimeWindow'
     ReservationFailureReason:
       description: >-
         An attribute that specifies the additional reason information if the reservation is failed.