# Problem creating a default payment term in account invoice
**URL:** https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014
**Category:** Developer
**Created:** [February 24, 2024, 11:46am UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014 "2024-02-24T11:46:34Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@david\_auto](https://discuss.tryton.org/u/david_auto)
#### Post date: [February 24, 2024, 11:46am UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014/1 "2024-02-24T11:46:34Z")
Greetings everyone: I have a problem; I want to set a default field in the account invoice module but I can’t manage to do it in any way,
not even with the simple code I used to test it. I get a successful execution response,
but the value doesn’t change, And ID 1 exists in the payment terms.
Could you help me with this issue? Thank you.
```auto
class Invoice(metaclass=PoolMeta):
'Invoice'
__name__ = 'account.invoice'
@staticmethod
def default_payment_term():
print('test')
return '1'
@staticmethod
def default_comment():
return 'test'
```
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [February 24, 2024, 11:56am UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014/2 "2024-02-24T11:56:50Z")
The default value for a `Many2One` field must be an **integer** which is the `id` of the target.
But also for payment term, the default value will be override by the customer or supplier payment term defined on the party.
---
### Author:  [@david\_auto](https://discuss.tryton.org/u/david_auto)
#### Post date: [February 24, 2024, 12:22pm UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014/3 "2024-02-24T12:22:23Z")
Thank you for the responses, but I tried with ‘return 1’, ‘return ‘1’’, and there’s no way. It always happens without selecting the client, but it never takes the payment term. I’m completely stuck.
trytond 7.0.6
trytond-account-invoice 7.0.1
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [February 24, 2024, 12:25pm UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014/4 "2024-02-24T12:25:54Z")
`on_change_party` is called by `on_change_type` which is probably called by the client due to the domain inversion applied for the domain on the action.
And `on_change_party` is clearing the payment term if there is no party selected.
So you should probably also set your default payment term in this case by extending `on_change_party`.
---
### Author:  [@david\_auto](https://discuss.tryton.org/u/david_auto)
#### Post date: [February 24, 2024, 1:52pm UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014/5 "2024-02-24T13:52:19Z")
I removed the on\_change\_party with the following code, and set the payment field to code 1, and it displays correctly. That was it. Thank you. Now I know where to act.
@fields.depends(‘party’, ‘type’)
def on\_change\_party(self):
print(‘2’)
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [February 24, 2024, 3:22pm UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014/6 "2024-02-24T15:22:15Z")
> [@david\_auto](#):
>
> removed the on\_change\_party
You should not remove existing code, it does important things.
The proper way is to always call the `super()` method and add your own business logic after.
---
### Author:  [@david\_auto](https://discuss.tryton.org/u/david_auto)
#### Post date: [February 24, 2024, 3:27pm UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014/7 "2024-02-24T15:27:05Z")
Sorry for explaining myself poorly. Yes, I simply disabled it to debug and verify if it was causing the issue. I need to provide the necessary logic. Thank you very much.
---
### Author:  [@system](https://discuss.tryton.org/u/system)
#### Post date: [February 25, 2024, 3:27am UTC](https://discuss.tryton.org/t/problem-creating-a-default-payment-term-in-account-invoice/7014/8 "2024-02-25T03:27:14Z")
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