Use the effective date of the stock move to generate sequence when creating lot

Closes #14899
(grafted from e5f7e95553a42dc02ac9ea57002523bc87471353)

--HG--
branch : 7.0

modules/production/production.py

@@ -874,7 +874,9 @@ class Production_Lot(metaclass=PoolMeta):
             for move in production.outputs:
                 if not move.lot and move.product.lot_is_required(
                         move.from_location, move.to_location):
-                    move.add_lot()
+                    date = move.effective_date or production.effective_date
+                    with Transaction().set_context(date=date):
+                        move.add_lot()
                     if move.lot:
                         lots.append(move.lot)
                         moves.append(move)

modules/stock_lot/stock.py

@@ -441,8 +441,11 @@ class Move(metaclass=PoolMeta):
         pass
 
     def add_lot(self):
+        transaction = Transaction()
         if not self.lot and self.product:
-            lot = self.product.create_lot()
+            date = transaction.context.get('date') or self.effective_date
+            with Transaction().set_context(date=date):
+                lot = self.product.create_lot()
             if lot:
                 self.lot = lot