diff --git a/v3_26_0/CDT-commonTypes-v3_26_0.xsd b/v3_26_0/CDT-commonTypes-v3_26_0.xsd
index 0753807dfbbef5d92f936183498714da2b5f8d84..abd3ecffb668abce9889fc70d1442b93167fa799 100644
--- a/v3_26_0/CDT-commonTypes-v3_26_0.xsd
+++ b/v3_26_0/CDT-commonTypes-v3_26_0.xsd
@@ -449,6 +449,7 @@ 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:pattern value="3"/>
 		</xs:restriction>