Hi Tanja,
When a document has a current balance of 0.00 (such as paid invoices), this does not prevent additional transactions to be appilied to it. Otherwise one wouldn't be able to make corrections to a paid invoice, such as if the payment was reversed and the invoice had to be restored, among others.
In your situation, you need to reverse one of the payments and get the invoices back to 0.00. Because you have BankRec, the easiest way is to run the NSF function (within View Transactions) on the deposit and the applicable 2 receipts. Don't generate any NSF fees. This will generate the applicable reversing transactions and create a reversing cash batch in AR as well.
Another possible way to reverse this is to create a negative cash amount of -475.00 in AR and apply them to the negative invoices, which would set the invoices back to zero.
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Regards,
Softrak Tech Support