Add a 'Previous' Button in Create Pay Cheques (to move backwards)

When you are processing a payroll you can press the Next button to move to the next employee. If you need to amend a pay you have already passed on from, you should have the same ability to move back, with a Previous button. If you save and close to go back to change a pay, this slows payroll down (as it saves), which is unbearable on large payrolls.