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.
This is kind of odd since most people pay by invoice.
If a customer owes 10,000 but only pays 9,000 for the month, then you need to list in the unpaid invoices report, which still has to be paid.
When will this feature be fixed?