diff --git a/OpenAPI/TS28541_NrNrm.yaml b/OpenAPI/TS28541_NrNrm.yaml
index 10fe7cd2d4c98c67ee3d5a7de0ba6bac8af3b349..38cc9d6501ce59a931a8a19fbbe8c674f2486169 100755
--- a/OpenAPI/TS28541_NrNrm.yaml
+++ b/OpenAPI/TS28541_NrNrm.yaml
@@ -1120,9 +1120,9 @@ components:
                       description: "Condition is BWP sets are supported"
                       $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnList'                    
                     rimRSMonitoringStartTime:
-                      type: string
+                      $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
                     rimRSMonitoringStopTime:
-                      type: string
+                      $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
                     rimRSMonitoringWindowDuration:
                       type: integer
                     rimRSMonitoringWindowStartingOffset: