# Add a button to sort invoice lines
**URL:** https://discuss.tryton.org/t/add-a-button-to-sort-invoice-lines/7153
**Category:** Developer
**Created:** [April 3, 2024, 2:48pm UTC](https://discuss.tryton.org/t/add-a-button-to-sort-invoice-lines/7153 "2024-04-03T14:48:01Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@mstma](https://discuss.tryton.org/u/mstma)
#### Post date: [April 3, 2024, 2:48pm UTC](https://discuss.tryton.org/t/add-a-button-to-sort-invoice-lines/7153/1 "2024-04-03T14:48:01Z")
I have the same problem as @shafi12 when trying to add an action “sort\_lines” to the account\_invoice module. Please have a look at my code. I get the error “Forbidden 403” when selecting the button in the Tryton client (first I just tried to make log entry when selecting the action button).
_invoice.xml_
```auto
account.invoice
invoice_form
sort_lines
Sort lines
```
_invoice.py_
```auto
from trytond.model import fields, ModelView, Workflow
from trytond.pool import PoolMeta, Pool
from trytond.pyson import Eval
import logging
logger = logging.getLogger( __name__ )
class Invoice(metaclass=PoolMeta):
__name__ = 'account.invoice'
sort_state = fields.Selection([
('unsorted', "Unsorted"),
('sorted', "Sorted")
],
"Sort state", required=True,
readonly=True, sort=False
)
@classmethod
def __setup__ (cls):
super(). __setup__ ()
cls._transitions.update({
('unsorted', 'sorted'),
})
cls._buttons.update({
'sort_lines': {
'readonly': Eval('sort_state') == 'sorted',
'depends': ['sort_state']
}
})
@classmethod
def default_sort_state(cls):
return 'unsorted'
@classmethod
@ModelView.button
def sort_lines(cls, invoices):
for invoice in invoices:
logger.info("sorting invoice: id {}: recepient {}".format(invoice.id, invoice.party.name))
```
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [April 3, 2024, 2:55pm UTC](https://discuss.tryton.org/t/add-a-button-to-sort-invoice-lines/7153/2 "2024-04-03T14:55:53Z")
For me you `Invoice` class is not correctly registered in the `Pool` so the final `account.invoice` object does not contain the button which raises `FORBIDDEN` when being called.
---
### Author:  [@mstma](https://discuss.tryton.org/u/mstma)
#### Post date: [April 3, 2024, 4:21pm UTC](https://discuss.tryton.org/t/add-a-button-to-sort-invoice-lines/7153/3 "2024-04-03T16:21:50Z")
I followed the example “Extend model” in the modul tutorial ([Extend model — Tryton server](https://docs.tryton.org/latest/server/tutorial/module/extend.html#extend-model)). Here is my _ **init**.py_ :
```auto
from trytond.pool import Pool
from . import invoice
__all__ = ['register']
def register():
Pool.register(
invoice.Invoice,
module='sort-invoice-grouping', type_='model')
```
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [April 3, 2024, 4:22pm UTC](https://discuss.tryton.org/t/add-a-button-to-sort-invoice-lines/7153/4 "2024-04-03T16:22:56Z")
> [@mstma](#):
>
> `'sort-invoice-grouping'`
This does not seem to be a valid module name.
---
### Author:  [@mstma](https://discuss.tryton.org/u/mstma)
#### Post date: [April 4, 2024, 5:23pm UTC](https://discuss.tryton.org/t/add-a-button-to-sort-invoice-lines/7153/5 "2024-04-04T17:23:29Z")
Thanks, that was the error. I changed the module name from `sort-invoice-grouping` to `sort_invoice_groupint` and it works; so no dashes, only underscore in the module name! The register call is now:
```auto
def register():
Pool.register(
invoice.Invoice,
module='sort_invoice_grouping', type_='model')
```
---
### Author:  [@system](https://discuss.tryton.org/u/system)
#### Post date: [April 5, 2024, 5:23am UTC](https://discuss.tryton.org/t/add-a-button-to-sort-invoice-lines/7153/6 "2024-04-05T05:23:30Z")
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