diff --git a/product/ERP5/PropertySheet/AppliedRule.py b/product/ERP5/PropertySheet/AppliedRule.py
index 3ecbc831a7c472837856bce065c9926981cfc82c..dd18f12526e22f803cc0cfd58623b15492ad93fb 100755
--- a/product/ERP5/PropertySheet/AppliedRule.py
+++ b/product/ERP5/PropertySheet/AppliedRule.py
@@ -32,6 +32,10 @@ class AppliedRule:
   """
 
   _properties = (
+        {   'id'          : 'last_expand_simulation_state',
+            'description' : '',
+            'type'        : 'string',
+            'mode'        : 'w' },
   )
 
   _categories = ('specialise', 'causality', 'order', )