What's the difference between rolling back and reversing a payment action?

The Roll Back action deletes the process and leaves no audit trail. For example, you might roll back the prepayment process if you discover an error before generating payments.

The Reverse action reverses the payroll calculation, generates a negative run result to offset the original run result, and leaves an audit trail. For example, you might reverse the calculation for a payment that you made in error and didn't issue.