[FIX] purchase: change invoice date

- Main currency: USD
- Create a PO in EUR
- Create an invoice from the PO
- The invoice is in USD and the exchange rate is applied
- Change the currency to EUR

The conversion is not applied anymore.

The original issue was that changing the date would overwrite any amount
modified in the invoice. Actually, the dependency on the date is not
really necessary. Indeed, this is supposed to help enconding invoices,
but it is likely that:
- If the PO is issued in a currency A, the bill received is in currency
  A.
  => no conversion necessary (solved from 11.1).
- If the PO is issued in a currency A and the bill received is in
  currency B, the exchange rate used by the vendor is different from
  ours.
  => manual corrections are necessary

Therefore, we remove the dependency on the date for the amount
recomputation. However, we still use it in the onchange. This way:
- the amount estimated should be close to the amount requested
- we avoid unexpected recomputation of amounts

Introduced with d8112b0238.

opw-805926

0 files changed, 0 insertions, 0 deletions