diff --git a/stock.py b/stock.py
index b2e11a9706..1cc988d9df 100644
--- a/stock.py
+++ b/stock.py
@@ -30,7 +30,8 @@ class Move:
     @classmethod
     def __setup__(cls):
         super(Move, cls).__setup__()
-        cls._allow_modify_closed_period.add('anglo_saxon_quantity')
+        cls._allow_modify_closed_period.update(['in_anglo_saxon_quantity',
+                'out_anglo_saxon_quantity'])
         cls._sql_constraints += [
             ('check_in_anglo_saxon_quantity',
                 'CHECK(quantity >= in_anglo_saxon_quantity)',