diff --git a/OpenAPI/TS28623_GenericNrm.yaml b/OpenAPI/TS28623_GenericNrm.yaml
index e5d16a1949db3526a0c9591819064a929c9c617a..3152c0754f37df89670b9921a0853d25eb51a272 100755
--- a/OpenAPI/TS28623_GenericNrm.yaml
+++ b/OpenAPI/TS28623_GenericNrm.yaml
@@ -1485,6 +1485,8 @@ components:
             - 150ms
             - 300ms
             - 500ms
+      minItems: 0
+      maxItems: 255
 
 #-------- end of Definition of types used in Trace control NRM fragment ----------