diff --git a/CDT-enumerationTypes.xsd b/CDT-enumerationTypes.xsd
index 3cba84e8d2f7cc95e05fd47c57bc8e1fecbe34f9..52bf392bca83dd4c8357fc7916786d591c1323b8 100644
--- a/CDT-enumerationTypes.xsd
+++ b/CDT-enumerationTypes.xsd
@@ -383,6 +383,8 @@ 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" />              
             <!-- NOT_IMPLEMENTED           -->