diff --git a/CDT-responsePrimitive.xsd b/CDT-responsePrimitive.xsd
index 73653b24ed853f2f45503f26e5169c3d1336ab90..ca0ea3d3874e341781b822c6179619b4df2b5a13 100644
--- a/CDT-responsePrimitive.xsd
+++ b/CDT-responsePrimitive.xsd
@@ -159,7 +159,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
   
   <xs:complexType name="listOfChildResourceRef">    
     <xs:sequence>   
-      <xs:element name="resourceRef" type="m2m:childResourceRef" minOccurs="1" maxOccurs="unbounded" />      
+      <xs:element name="resourceRef" type="m2m:childResourceRef" minOccurs="0" maxOccurs="unbounded" />      
     </xs:sequence> 	       
   </xs:complexType>