I recently submitted a Pay Run via STP to the ATO, but I included an incorrect employee. how to fix it?

You can unlock and refinalise your pay run if there's no super payment processed on it, Jinhong. Let me help you with that.

Please know that if super payments have been processed, you can only create an ad hoc pay run for the incorrect employee. This new pay event is used to lodge a reversal to fix the prior pay run submitted to the ATO.

Now, let's proceed to unlock your pay run:

1. Go to Pay Runs and then select the pay run you wish to unlock. 
2. Head to the Pay Run Actions dropdown and select Unlock.
3. Write a Comment about why you’re unlocking the Pay Run, then select Unlock.
4. Make the necessary corrections.

After correcting you data, let's finalise it and notify ATO about the changes you've made.

To do so, here's how:

1. Navigate to the Reports tab.
2. Click Single Touch Payroll, found in the ATO Reporting column.
3. Choose the Create update event.
4. Select the appropriate Financial year and Pay schedule, then Create.

For further guidance, please see this article: Create and lodge an update event in QuickBooks Online.

If you have other questions, feel free to comment them below.