Index: lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java
===================================================================
diff -u -r5cf94a873af22670c1bcfb832c7e868ef168333a -rcc9e5b829d2101f5357087abaa283e9014fefadb
--- lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java	(.../ForumService.java)	(revision 5cf94a873af22670c1bcfb832c7e868ef168333a)
+++ lams_tool_forum/src/java/org/lamsfoundation/lams/tool/forum/service/ForumService.java	(.../ForumService.java)	(revision cc9e5b829d2101f5357087abaa283e9014fefadb)
@@ -706,6 +706,7 @@
 				item.setReport(null);
 				item.setReplyNumber(0);
 				item.setParent(null);
+				item.setSessionClones(null);
 			}
 		}
 		toolContentObj.setMessages(authorItems);
@@ -757,6 +758,8 @@
 			for(Message item:items){
 				item.setCreatedBy(user);
 				item.setIsAuthored(true);
+				item.setForum(toolContentObj);
+				item.setSessionClones(new HashSet());
 				createRootTopic(toolContentObj.getUid(),(ForumToolSession) null,item);
 			}
 		} catch (ImportToolContentException e) {
@@ -803,7 +806,7 @@
 		session.setStatus(ForumConstants.STATUS_CONTENT_COPYED);
 
 		forumToolSessionDao.saveOrUpdate(session);
-
+		log.debug("tool session ["+session.getSessionId()+"] created.");
 	}
 
 	public String leaveToolSession(Long toolSessionId, Long learnerId) throws DataMissingException, ToolException {