diff --git a/CDT-enumerationTypes.xsd b/CDT-enumerationTypes.xsd
index 80c42ee3f1a858148419e43ac67e7d774e70969a..3d82a144f08a2aa42692e64b4b032422fe3031d4 100644
--- a/CDT-enumerationTypes.xsd
+++ b/CDT-enumerationTypes.xsd
@@ -384,6 +384,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 			<xs:enumeration value="4124" /> 
 			<!-- SPECIALIZATION_SCHEMA_NOT_FOUND -->
 			<xs:enumeration value="4125" />    
+			<!-- APP_RULE_VALIDATION_FAILED -->
+			<xs:enumeration value="4126" />    
 			
 			<!-- INTERNAL_SERVER_ERROR     -->
 			<xs:enumeration value="5000" />