Overpayment/Duplicate Payroll

Hi

I hadn't used payroll in MYOB in some time and had to run a payroll for a couple of people last week. Unfortunately, the employee set up on salary I processed incorrectly. 

 

The employee was paid Base Hourly 32 hours plus 8 hours public holiday. But I forgot to remove the base salary line which automatically populates and she ended up being paid double what she should have been paid.

 

The employee has opted to pay the money back. But how do I put this through MYOB? 

 

I looked at other questions about overpayments, but when I tried to enter a negative amount against the salary, it didn't reduce tax or super. It also wouldn't let me manually reduce the super.

 

Also what date should I be using for the payment date? Would that be the date the money is returned or the same date it was originally paid?

 

Thanks