=== modified file 'dhis-2/dhis-services/dhis-service-core/src/main/resources/org/hisp/dhis/attribute/hibernate/Attribute.hbm.xml'
--- dhis-2/dhis-services/dhis-service-core/src/main/resources/org/hisp/dhis/attribute/hibernate/Attribute.hbm.xml	2015-11-18 04:39:26 +0000
+++ dhis-2/dhis-services/dhis-service-core/src/main/resources/org/hisp/dhis/attribute/hibernate/Attribute.hbm.xml	2015-11-18 11:50:36 +0000
@@ -27,7 +27,7 @@
 
     <property name="mandatory" not-null="true" />
 
-    <property name="unique" column="isunique" not-null="true" />
+    <property name="unique" column="isunique" not-null="false" />
 
     <property name="dataElementAttribute" not-null="true" />