Hi Tanja,
You got it right. Because the deposit/receipt was for a customer not existing in AR, you will not be able to process an NSF Check in this way. If you want to reverse the amounts for GL, you need to use the Reconciliation function and Reverse the deposit. This will generate the entries to reverse the Bank and Distribution accounts that were originally posted to by the deposit.
If there are any further bank charges or other amounts that would affect the bank balance, you would have to enter them in a new BankRec batch.
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Regards,
Softrak Tech Support