Added cost price to lots by locations.

__init__.py

@@ -7,4 +7,5 @@ from . import stock
 def register():
     Pool.register(
         stock.Lot,
+        stock.LotsByLocations,
         module='stock_lot_cost_price', type_='model')

stock.py

@@ -26,3 +26,10 @@ class Lot(metaclass=PoolMeta):
         ], order=[('effective_date', 'DESC')])
         if moves:
             return moves[0].origin.unit_price
+
+
+class LotsByLocations(metaclass=PoolMeta):
+    __name__ = 'stock.lots_by_locations'
+
+    cost_price = fields.Function(fields.Numeric(
+        'Cost price', digits=price_digits), 'get_lot')