diff --git a/source/java/org/alfresco/repo/domain/hibernate/Node.hbm.xml b/source/java/org/alfresco/repo/domain/hibernate/Node.hbm.xml
index 8612cb7aed..a27b781647 100644
--- a/source/java/org/alfresco/repo/domain/hibernate/Node.hbm.xml
+++ b/source/java/org/alfresco/repo/domain/hibernate/Node.hbm.xml
@@ -137,31 +137,29 @@
       <id name="id" column="id" type="long" >
          <generator class="native" />
       </id>
-      <natural-id mutable="true">
-         <!-- forward assoc to parent node -->
-         <many-to-one 
-               name="parent"
-               class="org.alfresco.repo.domain.hibernate.NodeImpl"
-               lazy="proxy"
-               fetch="select"
-               optimistic-lock="true"
-               not-null="true"
-               unique-key="UIDX_CHILD_NAME" >
-            <column name="parent_node_id" />
-         </many-to-one>
-         <!-- forward assoc to child node -->
-         <many-to-one
-               name="child" 
-               lazy="proxy"
-               fetch="select"
-               class="org.alfresco.repo.domain.hibernate.NodeImpl"
-               optimistic-lock="true"
-               not-null="true" >
-            <column name="child_node_id" />
-         </many-to-one>
-         <property name="typeQName" column="type_qname" type="QName" length="255" not-null="true" unique-key="UIDX_CHILD_NAME" />
-         <property name="qname" column="qname" type="QName" length="255" not-null="true" />
-      </natural-id>
+      <!-- forward assoc to parent node -->
+      <many-to-one 
+            name="parent"
+            class="org.alfresco.repo.domain.hibernate.NodeImpl"
+            lazy="proxy"
+            fetch="select"
+            optimistic-lock="true"
+            not-null="true"
+            unique-key="UIDX_CHILD_NAME" >
+         <column name="parent_node_id" />
+      </many-to-one>
+      <!-- forward assoc to child node -->
+      <many-to-one
+            name="child" 
+            lazy="proxy"
+            fetch="select"
+            class="org.alfresco.repo.domain.hibernate.NodeImpl"
+            optimistic-lock="true"
+            not-null="true" >
+         <column name="child_node_id" />
+      </many-to-one>
+      <property name="typeQName" column="type_qname" type="QName" length="255" not-null="true" unique-key="UIDX_CHILD_NAME" />
+      <property name="qname" column="qname" type="QName" length="255" not-null="true" />
       <property name="childNodeName" column="child_node_name" type="string" length="50" not-null="true" unique-key="UIDX_CHILD_NAME" />
       <property name="childNodeNameCrc" column="child_node_name_crc" type="long" not-null="true" unique-key="UIDX_CHILD_NAME" />
       <property name="isPrimary" column="is_primary" />