Let's take two transactions all the way through the system.
A House Charge followed by a Received on Account for the same customer, same dollar amount.
Then we'll reconcile cash trays and apply the payment in the host accounting system.
We left inventory, cost of goods sold and sales tax out of this example to make it easy to follow.
The net result is a 3.00 credit to sales and a 3.00 debit to checking (cash) account.