There are the following statuses:
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Paid
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Open
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Partially paid (= simultaneously overpaid)
When assigning incoming payments, check whether the invoice is cleared. If an invoice is not set to "paid", this may be due to the following reasons:
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"Open" → the invoice was neither paid by the customer nor completely cleared with a full credit/cancellation invoice
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"Partially paid" → the invoice has been partially paid or partially credited/cancelled by you. Alternatively, the customer has made a payment, the credit note has the same amount. Then the customer has to get the paid amount back in full and so has an overpayment
If the invoice is set to "paid", then:
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The customer has paid the amount in full, or:
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You have credited the invoice in full (invoice amount 100 EUR, credit amount 100 EUR → balances to "0"), or:
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The customer has paid a part and you have cleared the other part with a credit/cancellation invoice