diff --git a/config/alfresco/model/contentModel.xml b/config/alfresco/model/contentModel.xml
index 09d613dfc4..0f38776be5 100644
--- a/config/alfresco/model/contentModel.xml
+++ b/config/alfresco/model/contentModel.xml
@@ -177,8 +177,14 @@
          <parent>cm:cmobject</parent>
          <associations>
             <child-association name="cm:categories">
-               <target>
+               <source>
+                   <mandatory>false</mandatory>
+                   <many>true</many>
+               </source>
+               <target> 
                   <class>cm:category</class>
+                  <mandatory>false</mandatory>
+                  <many>true</many>
                </target>
             </child-association>
          </associations>
@@ -192,8 +198,14 @@
          <parent>cm:cmobject</parent>
          <associations>
             <child-association name="cm:subcategories">
+               <source>
+                   <mandatory>false</mandatory>
+                   <many>true</many>
+               </source>
                <target>
                   <class>cm:category</class>
+                  <mandatory>false</mandatory>
+                  <many>true</many>
                </target>
             </child-association>
          </associations>