Allocating the payment fully to an invoice for the full amount is equivalent to paying the invoice. This means that general rules for financial discounting apply.

For invoices with credit terms that define discounts for early payment that are registered and paid before the discount due date, the discount percentage is applied.

In some countries, a tax correction posting for the discount is registered upon saving the allocation.

All allocated open items must have the same currency as the payment currency. In the exceptional case that a customer pays an invoice with a different currency, the payment can be allocated to a prepayment, which can afterward be adjusted to the invoice using Open Item Adjustment.

Once invoices are linked, the base currency value of the payment is calculated as the sum of the base currency values of the linked invoices; the payment inherits the average exchange rate of the invoices.