diff --git a/tryton/modules/stock_lot/stock.py b/tryton/modules/stock_lot/stock.py
index 734018dbe8..1367b57e5f 100644
--- a/tryton/modules/stock_lot/stock.py
+++ b/tryton/modules/stock_lot/stock.py
@@ -420,8 +420,7 @@ class Move(metaclass=PoolMeta):

     def check_lot(self):
         "Check if lot is required"
-        if (self.state == 'done'
-                and self.internal_quantity
+        if (self.internal_quantity
                 and not self.lot
                 and self.product.lot_is_required(
                     self.from_location, self.to_location)):
@@ -430,8 +429,9 @@ class Move(metaclass=PoolMeta):
                     product=self.product.rec_name))

     @classmethod
-    def validate(cls, moves):
-        super(Move, cls).validate(moves)
+    @ModelView.button
+    def do(cls, moves):
+        super().do(moves)
         for move in moves:
             move.check_lot()