If you have processed an ACH file and submitted it to the bank, and approved the file for processing, it is necessary to create a 'Reversal' file if it is necessary to cancel those transactions.
Go to the Reports in the left index, and then 'Past 3 Months' report.
Click the pencil icon and choose the transactions that need to be reversed.
After selecting the transaction(s) that needs to be reversed, click on the Reversals icon.
You will get the popup asking if you want to create a Reversal file -- click 'Yes'.
This creates reversed transactions that are holding in Unprocessed Records.
You'll then go to the Home Page to 'Create ACH File'.
When the ACH file is created, it will show the word 'REVERSAL' on the second line:
