In OIS350, search the Order
On the invoice line : related / Correct/credit (Ctrl+14)
You reach OIS380 :
1 / Be sure to select :
- the method 2 - Credit/reinvoicing
- negative sign
- all credit
- correct VAT code
2 / On the main page, click on Interactive button
3 / Be back to the OIS350 (F3) :the credit note appears and a mail is send in your emailbox.