Prevent using same sequence on earlier customer invoice: which date to use?

[sergyo (Sergio Morillo)]

@ced

Sorry but for me your example has contradictions. You can not travel in time from the 15 January to issue an new invoice on the 31 December.

IIUC the @roliver example says:
today 15th January issue and invoice with invoice_date today (15th January) and accounting_date 30th December.
This is allowed in Spanish account because goods were shipped on 30th December, so taxes can be posted on this date.

@pokoli

In the mentioned example does not talk about the accounting date.

Indeed accounting date would be 30th December.

@pokoli

So in such case, you just set the invoice date on 16th of the next month despite the goods have been set on the past month.

But invoice taxes need to be on December as mentioned above.