Index: lams_common/conf/hibernate/mappings/org/lamsfoundation/lams/usermanagement/User.hbm.xml
===================================================================
diff -u -r46bcc7bfdb3c82d1f241c629b3173f53ae606dca -r8e72190131bb0a44fc3bb118c653793dd99cec7a
--- lams_common/conf/hibernate/mappings/org/lamsfoundation/lams/usermanagement/User.hbm.xml	(.../User.hbm.xml)	(revision 46bcc7bfdb3c82d1f241c629b3173f53ae606dca)
+++ lams_common/conf/hibernate/mappings/org/lamsfoundation/lams/usermanagement/User.hbm.xml	(.../User.hbm.xml)	(revision 8e72190131bb0a44fc3bb118c653793dd99cec7a)
@@ -520,8 +520,7 @@
         name="lamsCommunityUsername"
         type="java.lang.String"
         column="lams_community_username"
-        not-null="true"
-        unique="true"
+        not-null="false"
         length="255"
     >
         <meta attribute="use-in-equals">true</meta>