diff --git a/trytond/trytond/modules/production/production.py b/trytond/trytond/modules/production/production.py
index acd7a35..1ccc421 100644
--- a/trytond/trytond/modules/production/production.py
+++ b/trytond/trytond/modules/production/production.py
@@ -468,12 +468,6 @@ class Production(Workflow, ModelSQL, ModelView):
                     moves.append(output)
         Move.save(moves)
 
-    @classmethod
-    def validate(cls, productions):
-        super(Production, cls).validate(productions)
-        for production in productions:
-            production.check_cost()
-
     @property
     def output_cost(self):
         cost_price = Decimal(0)
@@ -481,17 +475,6 @@ class Production(Workflow, ModelSQL, ModelView):
             cost_price += (Decimal(str(output.quantity)) * output.unit_price)
         return cost_price

-    def check_cost(self):
-        if self.state != 'done':
-            return
-        cost_price = self.output_cost
-        if not self.company.currency.is_zero(self.cost - cost_price):
-            raise CostError(gettext(
-                    'production.msg_uneven_costs',
-                    production=self.rec_name,
-                    costs=self.cost,
-                    outputs=cost_price))
-
     @classmethod
     def view_attributes(cls):
         return [