diff --git a/mso-catalog-db/src/main/resources/ServiceToResourceCustomization.hbm.xml b/mso-catalog-db/src/main/resources/ServiceToResourceCustomization.hbm.xml
index d806b48..cd37fc9 100644
--- a/mso-catalog-db/src/main/resources/ServiceToResourceCustomization.hbm.xml
+++ b/mso-catalog-db/src/main/resources/ServiceToResourceCustomization.hbm.xml
@@ -29,11 +29,11 @@
 		<composite-id>
 			<key-property name="modelType"  					type="string" column="MODEL_TYPE" length="20" />
 			<key-property name="resourceModelCustomizationUUID" type="string" column="RESOURCE_MODEL_CUSTOMIZATION_UUID" length="200" />
+			<key-property name="serviceModelUUID" 				type="string" column="SERVICE_MODEL_UUID" length="200" />
 		</composite-id>
 		<property name="created" type="timestamp" generated="insert" update="false" insert="false" not-null="true">
           <column name="CREATION_TIMESTAMP" default="CURRENT_TIMESTAMP"/>
         </property>
-		<property name="serviceModelUUID" 				type="string" column="SERVICE_MODEL_UUID" length="200" not-null="true"/>
 
 	</class>
 </hibernate-mapping>