diff --git a/CDT-AE.xsd b/CDT-AE.xsd
index 021b17c6e3c651808b520d0b3fa8abb8913e5e38..0c2b53dc2c1a61aa59caf62ade6854527737944d 100644
--- a/CDT-AE.xsd
+++ b/CDT-AE.xsd
@@ -79,7 +79,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 								<xs:element ref="m2m:group" />
 								<xs:element ref="m2m:accessControlPolicy" />
 								<xs:element ref="m2m:subscription" />
-								<xs:element ref="m2m:pollingChannel" />
+								<xs:element ref="m2m:pollingChannel" maxOccurs="1"/>
 								<xs:element ref="m2m:semanticDescriptor" />
 								<xs:element ref="m2m:timeSeries" />
 								<xs:element ref="m2m:sg_flexContainerResource" />