# Strange behavior proteus vs web client
**URL:** https://discuss.tryton.org/t/strange-behavior-proteus-vs-web-client/8295
**Category:** Developer
**Created:** [February 10, 2025, 11:44am UTC](https://discuss.tryton.org/t/strange-behavior-proteus-vs-web-client/8295 "2025-02-10T11:44:42Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@herve\_02](https://discuss.tryton.org/u/herve_02)
#### Post date: [February 10, 2025, 11:44am UTC](https://discuss.tryton.org/t/strange-behavior-proteus-vs-web-client/8295/1 "2025-02-10T11:44:42Z")
web client
1 create a sale just save, it no validation at all.
AND
- web client
..Quote and confirm the sale
…go to invoice
Post invoice =\> ok
- proteus
Sale= Model.get(‘sale.sale’)
sale=Sale(num\_sale)
sale.click(‘quote’)
sale.click(‘confirm’)
sale.invoices[0].click(‘post’) (or for inv in sale.invoices … inv.click(‘post’)
#### trytond.modules.account\_invoice.exceptions.InvoiceNumberError:
#### To number the invoice “(52)”, you must set an accounting date after “01/12/2025” because the sequence “Clients\_25” has already been used for invoice “31234”
clients\_25 is the sequence for customer invoice.
If i go back to web client i have the same error for that invoice…
---
### Author:  [@herve\_02](https://discuss.tryton.org/u/herve_02)
#### Post date: [February 10, 2025, 1:07pm UTC](https://discuss.tryton.org/t/strange-behavior-proteus-vs-web-client/8295/2 "2025-02-10T13:07:31Z")
it seems to work , i am narrowing down…
---
### Author:  [@herve\_02](https://discuss.tryton.org/u/herve_02)
#### Post date: [February 10, 2025, 2:34pm UTC](https://discuss.tryton.org/t/strange-behavior-proteus-vs-web-client/8295/3 "2025-02-10T14:34:45Z")
so i narrow down - maybe a mis configuration i’ll open a new subject.
i finally found…
play with proteus i gave a date french format that was inserted french format (so in the future for the tryton databases ???) and the code
says
```auto
after_invoices = cls.search([
('sequence', '=', invoice.sequence),
['OR',
('accounting_date', '>', date),
[
('accounting_date', '=', None),
('invoice_date', '>', date),
],
],
], limit=1, order=[('accounting_date', 'DESC')])
```
so it is not possible to enter an invoice with a date BEFORE one invoice entered. the error message was not helping at all
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### Author:  [@system](https://discuss.tryton.org/u/system)
#### Post date: [February 20, 2025, 12:40pm UTC](https://discuss.tryton.org/t/strange-behavior-proteus-vs-web-client/8295/4 "2025-02-20T12:40:31Z")
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