diff --git a/OpenAPI/TS28623_GenericNrm.yaml b/OpenAPI/TS28623_GenericNrm.yaml
index 6629b061a28552b4f76e68ca525f4bbfd3278a31..2b3e00dd4c7dee6f4fcc67aa342e493010d86ea9 100755
--- a/OpenAPI/TS28623_GenericNrm.yaml
+++ b/OpenAPI/TS28623_GenericNrm.yaml
@@ -1444,6 +1444,8 @@ components:
             - 150ms
             - 300ms
             - 500ms
+      minItems: 0
+      maxItems: 255
 
 #-------- end of Definition of types used in Trace control NRM fragment ----------