Index: lams_admin/src/java/org/lamsfoundation/lams/admin/web/controller/ExtServerManagementController.java
===================================================================
diff -u -r366880f4a40fe21eb563db2ccd2eb0dad3dc8aca -rd3f71d98dafc80c97dd37a258b46313ba89c95ad
--- lams_admin/src/java/org/lamsfoundation/lams/admin/web/controller/ExtServerManagementController.java	(.../ExtServerManagementController.java)	(revision 366880f4a40fe21eb563db2ccd2eb0dad3dc8aca)
+++ lams_admin/src/java/org/lamsfoundation/lams/admin/web/controller/ExtServerManagementController.java	(.../ExtServerManagementController.java)	(revision d3f71d98dafc80c97dd37a258b46313ba89c95ad)
@@ -138,21 +138,6 @@
 		    }
 		}
 	    }
-
-	    List<ExtServer> listPrefix = userManagementService.findByProperty(ExtServer.class, "prefix",
-		    extServerForm.getPrefix());
-	    if (listPrefix != null && listPrefix.size() > 0) {
-		if (sid.equals(0)) {//new map
-		    errorMap.add("prefix", messageService.getMessage("error.not.unique",
-			    new Object[] { messageService.getMessage("sysadmin.prefix") }));
-		} else {
-		    ExtServer map = listPrefix.get(0);
-		    if (!map.getSid().equals(sid)) {
-			errorMap.add("prefix", messageService.getMessage("error.not.unique",
-				new Object[] { messageService.getMessage("sysadmin.prefix") }));
-		    }
-		}
-	    }
 	}
 
 	if (errorMap.isEmpty()) {