--- a/misc/migration/3.4.3_Any.py	Wed Mar 27 14:53:40 2013 +0100
+++ b/misc/migration/3.4.3_Any.py	Wed Mar 27 15:38:05 2013 +0100
@@ -1,2 +1,1 @@
-# sync and restart to make sure cwuri does not appear in forms
-sync_schema_props_perms()
+raise NotImplementedError("Cannot migrate such an old version. Use intermediate Cubiweb version (try 3.16.x)")