Error adding tax in sales automatically

Support System Administrator
1

Hello, I started with tryton (5.8) a few days ago and have a problem adding tax to sales automatically. The first steps I already made were importing German SKR03 account template, adding a company and a product with a category containing the tax (“Umsatzsteuer-Normalsatz”). When I create a sale and add a product to the sale line I get the following error:

AttributeError: ‘account.tax’ Model has no attribute ‘sequence’: None

On the taxes tab of this line an empty entry is added, when I try to save the line i get the message “The values of “Taxes” are not valid”. If a add the tax manually there is no problem, the tax is added correctly.

I tried to add a sequence to the taxes (also to “Umsatzsteuer-Normalsatz”) but this didn’t work. Thanks for your help.

2

Without the full traceback it is difficult to answer.

3

Thanks for your quick reply. Here is the traceback:

Traceback (most recent call last):
  File "/trytond/model/model.py", line 282, in __getattr__
    return self._values[name]
TypeError: 'NoneType' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/trytond/wsgi.py", line 116, in dispatch_request
    return endpoint(request, **request.view_args)
  File "/trytond/protocols/dispatcher.py", line 48, in rpc
    request, database_name, *request.rpc_params)
  File "/wrapt/wrappers.py", line 567, in __call__
    args, kwargs)
  File "/trytond/wsgi.py", line 83, in auth_required
    return wrapped(*args, **kwargs)
  File "/trytond/protocols/wrappers.py", line 131, in wrapper
    return func(request, pool, *args, **kwargs)
  File "/trytond/protocols/dispatcher.py", line 186, in _dispatch
    result = rpc.result(meth(inst, *c_args, **c_kwargs))
  File "/trytond/model/modelview.py", line 780, in on_change
    method()
  File "/trytond/model/modelview.py", line 88, in wrapper
    result = func(self, *args, **kwargs)
  File "/trytond/model/fields/field.py", line 118, in wrapper
    return func(self, *args, **kwargs)
  File "/trytond/modules/sale/sale.py", line 477, in on_change_lines
    self.tax_amount = self.get_tax_amount()
  File "/trytond/model/fields/field.py", line 118, in wrapper
    return func(self, *args, **kwargs)
  File "/trytond/modules/sale/sale.py", line 504, in get_tax_amount
    (v['amount'] for v in self._get_taxes().values()), Decimal(0))
  File "/trytond/model/fields/field.py", line 118, in wrapper
    return func(self, *args, **kwargs)
  File "/trytond/modules/account/tax.py", line 1173, in _get_taxes
    line.quantity, line.tax_date or self.tax_date)
  File "/trytond/modules/account/tax.py", line 1017, in compute
    taxes = cls.sort_taxes(taxes)
  File "/trytond/modules/account/tax.py", line 1002, in sort_taxes
    return sorted(taxes, key=key, reverse=reverse)
  File "/trytond/modules/account/tax.py", line 1001, in key
    return 0 if tax.sequence is None else 1, tax.sequence or 0, tax.id
  File "/trytond/model/modelstorage.py", line 1414, in __getattr__
    return super(ModelStorage, self).__getattr__(name)
  File "/trytond/model/model.py", line 285, in __getattr__
    % (self.__name__, name, self._values))
AttributeError: 'account.tax' Model has no attribute 'sequence': None
4

Have you any custom module? Because I think there are some code that wrongly create a new tax to add to the line instead of link existing tax.

5

No, I installed via pip and only added the sales module. I also imported the countries and currencies. Should I try a new installation?

6

The behavior is very strange and I can not reproduce it.
Could you provide the RPC log of the client (request and result) from when you create the sale line up to the error?

7

Are you sure to use sao from the same series? Because it looks like you do not have the sao changes from Issue 4140: Missing delete in on_change keywords - Tryton issue tracker but the trytond.

8

Thanks for your quick reply. I installed the whole system 2 month ago. The version of trytond is 5.8.5.
The package-lock.json from the installation of sao via npm shows the following:

"tryton-sao": {
  "version": "5.0.37",
  "resolved": "https://registry.npmjs.org/tryton-sao/-/tryton-sao-5.0.37.tg$
  "integrity": "sha512-ZyI2siZnpcFp9HmkQ2S4ZFDtvTUdHo/PZn3NsWKxf3a9WsHXrgga$
  "requires": {
	"bower": "1.8.12",
	"grunt": "0.4.5",
	"grunt-cli": "0.1.13",
	"grunt-contrib-concat": "0.5.1",
	"grunt-contrib-jshint": "0.11.3",
	"grunt-contrib-less": "1.4.1",
	"grunt-contrib-uglify": "0.9.2",
	"grunt-po2json": "0.3.0"
  }

Is there a documentation or a way to check if both versions are compatible with each other?

9

Yes, to make them comptable the first two digits of the versions should be equal. So if you are using trytond with version 5.8.5 you should use sao with version 5.8.x:

In your case you are using 5.0 series of sao, which makes it incompatible and causes the error.
Installing the right series of sao should fix your issue.

10

I documented for myself that I installed sao via “npm i tryton-sao”. I din’t realize this did not install the latest verison but the version 5.0.37.

So finalls I updated to latest verison with a simple “npm update” and now everything works fine. Many thanks for the great support.

11

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