Get return sale from sale's origin

issue10702
review369591002
(grafted from 125ab979d3e3f47dae2effaa3f23e338cb07b2d5)

--HG--
branch : 6.0

stock.py

@@ -165,8 +165,8 @@ class Move(metaclass=PoolMeta):
                 and self.origin.quantity < 0
                 and self.from_location.type != 'storage'
                 and self.to_location.type == 'storage'
-                and isinstance(self.origin.origin, Sale)):
-            sale = self.origin.origin
+                and isinstance(self.origin.sale.origin, Sale)):
+            sale = self.origin.sale.origin
             cost = Decimal(0)
             qty = Decimal(0)
             for move in sale.moves: