Is it possible to apply payment to an invoice ?

Express Invoice uses an account based payment system where payments are applied to the customer's account - not to a specific invoice. This makes it able to handle advance payments or payments without specified invoices much better. When you receive a payment the payment is applied to a customer not a specific invoice. You can however enter a soft cross-reference between a payment and invoice. This is for reference and easy of use only and is optional.

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