Sales/Purchases. How to add a payment from invoice?
1) A payment from invoice can be made only in invoice currency.
2) Go to Documents and search for the invoice you need to pay. Open it.
3) Click "Add a Payment". Select one of the payment methods available.
4) Enter payment details for the selected method.
5) If needed repeat steps 3 and 4.
5) Click "Post" to complete the operation.