Index: lams_common/conf/hibernate/mappings/org/lamsfoundation/lams/learningdesign/Activity.hbm.xml
===================================================================
diff -u -r6d3ec8d81f9e9041baa7330307a1d9fa77525842 -r92c8ee050180c6605cf296cd731711fae829dea8
--- lams_common/conf/hibernate/mappings/org/lamsfoundation/lams/learningdesign/Activity.hbm.xml	(.../Activity.hbm.xml)	(revision 6d3ec8d81f9e9041baa7330307a1d9fa77525842)
+++ lams_common/conf/hibernate/mappings/org/lamsfoundation/lams/learningdesign/Activity.hbm.xml	(.../Activity.hbm.xml)	(revision 92c8ee050180c6605cf296cd731711fae829dea8)
@@ -130,7 +130,7 @@
         												@hibernate.collection-key column="tool_session_id"
         										        @hibernate.collection-one-to-many class="org.lamsfoundation.lams.tool.ToolSession"
 			        </meta>
-			        <key><column name="tool_session_id" /></key>
+			        <key><column name="activity_id" /></key>
 			        <one-to-many class="org.lamsfoundation.lams.tool.ToolSession"/>
 			    </set>