"Previous Balance" line items being added to invoices after the invoice is closed

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Frequency: Low

Description: In rare cases, a "previous balance" line item will be added to invoices after the invoice has checked out. This will cause a closed invoice to open back up and show an amount due even when there is not. The previous balance also does not correspond to the assigned customer's account.

Example: Last month, a customer checked out for a reservation and paid in full. The invoice closed and the charges and payments were all correct on the invoice. Yesterday evening I was going through the list of open, outstanding invoices and I noticed that the invoice from last month is now shown as "open". When I view the invoice, I can now see that there is a line item for "previous balance" that should not be there.