There could be some damage to the client AR balance or it could be a payment is not applied in the payments list for this client, or it could be nothing. If Aged AR report, Billing Assistant and the balance on the AR screen of the customer all show balance of zero, then I would not worry about it. If Aged AR shows balance of zero but a positive and negative number, then you have an unapplied payment. That can easily be fixed from the transaction list. Find the transaction that is not applied and apply it.
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