You can make deduction of an item when a sale is still not closed. To do this, select the 'Deduct Item' checkbox. Now if you scan a barcode, the transaction will be a negative one.  There will be a minus sign in front of the amount.

You can make deduction even when there is no sale.  This means an item from a previous sale can be processed in a new sale receipt in this deduction mode. The negative "Total" value is then refunded to the customer. This facilitates the refund of a single item out of a list of goods purchased by a customer.

If however your shop does not allow monetary refund, the returned item can still be deducted by selling a higher-priced item along with the deduction on the same sale receipt.

When deduction is being performed, the Barcode, Qty and Cash boxes turn pink in colour to indicate that you are making deductions. To revert to normal sale mode uncheck the "Deduct Item" checkbox.

This Deduct mode together with Manual Entry mode can be used to give an ad-hoc discount to a customer.

When the barcode label is missing from an item or the barcode is not recognised by the system, you can use "Lookup" button to do a search - based on barcode, description or dept - to find the correct barcode for that item.

If the search does not uncover the correct barcode for that item, you can use 'Manual Entry' to process the item. Select the 'Manual Entry' checkbox on the right and enter the Description and Price of the item.  Then press Enter key on your keyboard. The transaction is then accepted by the system. The illustration below shows how this is done: