Hi EESA
Thanks for your post. If the amounts are the same you can process an adjustment pay. Zero out all other amounts and hours, enter the hours as a positive against the public holiday wage category and a negative against the normal wage category.
With STP, the employee's YTD amounts are sent to the ATO each time you declare a pay run and each report overrides the previous one. So if you need to change a pay STP will be updated when you send the next report.
The Help Article, Changing a recorded pay, has detailed information.
Please let me know if you need further help.
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