diff --git a/OpenAPI/TS28541_NrNrm.yaml b/OpenAPI/TS28541_NrNrm.yaml
index 57f4ca808608155cd84962e7560fb2a2c100c122..6336389df0407797d5541c0023d69e0fd6658b96 100644
--- a/OpenAPI/TS28541_NrNrm.yaml
+++ b/OpenAPI/TS28541_NrNrm.yaml
@@ -882,9 +882,9 @@ 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: