Payroll - wrong payment category allocation

I have processed a few pay runs and realised I didn't set it up properly and my superannuation linked payable category was PAYG Withholding Payable. I have since created a new Superannuation Liability category but how do I fix these past pay runs so they are in the correct category? I have gone into the pay runs but there is no "reverse" button - I think this may be because I have processed the associated electronic payments.  

Thanks!