Payment term 90 days and payment first occurence of day 20, not possible with Odoo v8?

Question

I would like to configure a payment term of 90 days since invoice date and day 20.
This means that if invoice is 20/12/2015, then:
20/12/2015 + 90 days = 19/03/2016, so due date would be 20/03/2016.
But if configured 90 days + day 20 Odoo will go for day 20th of the next month (20/04/2016).
Is it possible to configure due date to be 20/03 in this case?

Rubén Cabrera · Answer

The problem is in the class account_payment_term from the file account.py in the account addon. There is a line in the method copute() that says:
next_date += relativedelta(day=line.days2, months=1)

If you change months to 0, it might be wrong when the amount of days in the "days" field results in a smaller day date than the one specified in days2.
I tried to post a link to the module we created to solve it, but it seems I'm not allowed to do so.

Nilim · Answer

Hi E.m.,

W.r.t your query I have gone through it and tried to replicate it.
Few recommendations which I would like to suggest are :-

1) By default in Odoo if we set *Day of the Month *as positive
it gives the day of the next month. And this is what is happening in
your case. This scan be done by following
*Accounting>Configuration>Miscellaneous>Payment Terms*

2) My recommendation would be to set *Day of the Month *as
Zero, if you do so it would be calculate for net days. By

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