The basic requirement to use a transaction cancellation is before closing a batch.
You should use a Return transaction to cancel a transaction after closing a batch.
Note: Cancellation in contactless transactions is not possible. To cancel the transactions that have taken place intact you will need to select the Return transaction with the same amount.
Regarding the Android POS devices, for both transactions you must select “Cancel” on the device. Then, depending on the status of the batch (closed or open) in which the transaction is located, the POS will automatically proceed to the corresponding Cancel (open batch) or Return (closed batch ) action, without the need to take any further action.