--- a/misc/migration/3.13.0_Any.py	Tue Jun 21 10:44:43 2011 +0200
+++ b/misc/migration/3.13.0_Any.py	Mon Jun 20 14:52:19 2011 +0200
@@ -1,3 +1,4 @@
 sync_schema_props_perms('cw_source', syncprops=False)
 add_attribute('CWSource', 'synchronizing')
-add_entity_type('BigInt')
+if schema['BigInt'].eid is None:
+    add_entity_type('BigInt')