Paying an invoice from a different invoice number

some of my customers pay using the same invoice number each month, why cant i use this invoice number when receiving payments anymore? the customer has no “accounts receivable” but the new invoices say overdue and the referenced invoice says overpaid??

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so this shouldnt happen?

this is a wrong accounting practice.
how can a payment be made for the same invoice when it has already been paid in full? its like going to a restaurant and paying them every day for the lunch you had few weeks back.

either allocate the payment to the proper invoice or do not select an invoice at all and let Manager allocate the payments to the pending invoices according to their age.

^ I think this is what you’re looking for, @HGB.