diff --git a/OpenAPI/TS28541_NrNrm.yaml b/OpenAPI/TS28541_NrNrm.yaml
index a009608ebc400469c5cd489a26ecc5a59ef353b2..6466237aaba533ec1cd1e77043688167d4c7dcc6 100755
--- a/OpenAPI/TS28541_NrNrm.yaml
+++ b/OpenAPI/TS28541_NrNrm.yaml
@@ -987,9 +987,9 @@ components:
                       items:
                         $ref: 'TS28623_ComDefs.yaml#/components/schemas/Dn'
                     rimRSMonitoringStartTime:
-                      type: string
+                      $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
                     rimRSMonitoringStopTime:
-                      type: string
+                      $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
                     rimRSMonitoringWindowDuration:
                       type: integer
                     rimRSMonitoringWindowStartingOffset: