Index: lams_tool_larsrc/src/java/org/lamsfoundation/lams/tool/rsrc/web/action/AuthoringAction.java
===================================================================
diff -u -r769b6b71f99525bc435678e762adc167a2702705 -r02dcebfc481a4470cf16ba4a5e70a51ea7237f8d
--- lams_tool_larsrc/src/java/org/lamsfoundation/lams/tool/rsrc/web/action/AuthoringAction.java	(.../AuthoringAction.java)	(revision 769b6b71f99525bc435678e762adc167a2702705)
+++ lams_tool_larsrc/src/java/org/lamsfoundation/lams/tool/rsrc/web/action/AuthoringAction.java	(.../AuthoringAction.java)	(revision 02dcebfc481a4470cf16ba4a5e70a51ea7237f8d)
@@ -509,6 +509,7 @@
 		
 		//**********************************Handle Authoring Instruction Attachement *********************
     	//merge attachment info
+		//so far, attPOSet will be empty if content is existed. because PropertyUtils.copyProperties() is executed
 		Set attPOSet = resourcePO.getAttachments();
 		if(attPOSet == null)
 			attPOSet = new HashSet();
@@ -561,7 +562,7 @@
     		}
     	}
     	resourcePO.setResourceItems(itemList);
-    	//delete them from database.
+    	//delete instructino file from database.
     	List delResourceItemList = getDeletedResourceItemList(sessionMap);
     	iter = delResourceItemList.iterator();
     	while(iter.hasNext()){