diff --git a/OpenAPI/TS28541_NrNrm.yaml b/OpenAPI/TS28541_NrNrm.yaml
index 9e124fe4857866c441a4d592cc9f7bf862923c0c..8987ea7f57e7e6349a24498b9b8d1444f43b7ee1 100755
--- a/OpenAPI/TS28541_NrNrm.yaml
+++ b/OpenAPI/TS28541_NrNrm.yaml
@@ -1106,9 +1106,9 @@ 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: