Example stock move: ``` >>> move = Move(101551) >>> move.cost_price_required True >>> move.unit_price_required False >>> move.cost_price Decimal('0.6300') >>> move.currency >>> move.from_location.type 'storage' >>> move.to_location.type 'production' ``` When try to recompute cost price, the traceback: ``` Traceback (most recent call last): File "/tryton/trytond/trytond/worker.py", line 144, in run_task task.run() File "/tryton/trytond/trytond/ir/queue_.py", line 177, in run getattr(Model, self.data['method'])( File "/tryton/trytond/trytond/modules/stock/product.py", line 333, in recompute_cost_price cost = getattr( ^^^^^^^^ File "/tryton/trytond/trytond/modules/stock/product.py", line 494, in recompute_cost_price_average unit_price = move.get_cost_price(product_cost_price=cost_price) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/modules/sale/stock.py", line 191, in get_cost_price return super().get_cost_price(product_cost_price=product_cost_price) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/modules/stock_lot_cost/stock.py", line 112, in get_cost_price cost_price = super().get_cost_price(product_cost_price=None) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/modules/stock/move.py", line 759, in get_cost_price return self.unit_price_company ^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/model/fields/function.py", line 160, in __get__ return super().__get__(inst, cls) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/model/fields/field.py", line 391, in __get__ return inst.__getattr__(self.name) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/model/modelstorage.py", line 1781, in __getattr__ read_data = self.read(list(index.keys()), list(ffields.keys())) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/model/modelsql.py", line 1153, in read getter_results = field.get( ^^^^^^^^^^ File "/tryton/trytond/trytond/model/fields/function.py", line 27, in wrapper return func(self, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/transaction.py", line 50, in wrapper return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/model/fields/function.py", line 136, in get return dict((name, call(name)) for name in names) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/model/fields/function.py", line 136, in <genexpr> return dict((name, call(name)) for name in names) ^^^^^^^^^^ File "/tryton/trytond/trytond/model/fields/function.py", line 127, in call return on_change_with_result(self, method(records, name)) ^^^^^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/modules/stock/move.py", line 444, in get_unit_price_company unit_price = Currency.compute( ^^^^^^^^^^^^^^^^^ File "/tryton/trytond/trytond/modules/currency/currency.py", line 198, in compute from_currency = cls(int(from_currency)) ^^^^^^^^^^^^^^^^^^ TypeError: int() argument must be a string, a bytes-like object or a real number, not 'NoneType' ``` See that stock move, currency is null.