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The payment selected from the list is opened containing all the information entered when the payment was taken. If the system password is set, editing of payments is protected.
Any field can be selected & the information edited. A receipt can be reprinted. The entire payment can be deleted from the system. Of course, G-E updates the client's account with any changes.
As you can see, if you make an error in G-E you have the tools to correct the mistake!