diff --git a/CDT-commonTypes.xsd b/CDT-commonTypes.xsd
index 932c3a000b8bc9313581e8d4b9061e0a3070fdda..26847a84cb10b359f6adeb172fbfc433560fb860 100644
--- a/CDT-commonTypes.xsd
+++ b/CDT-commonTypes.xsd
@@ -419,6 +419,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 	
 	<xs:simpleType name="releaseVersion">
 		<xs:restriction base="xs:string" >
+			<xs:pattern value="2"/>
 			<xs:pattern value="2a"/>
 		</xs:restriction>
 	</xs:simpleType>