We need to correct payslips for last year. The final FPS was already submitted but included errors. We deleted payrolls last time and submitted FPS but HMRC didn’t get

You've come to the right place for assistance, office290. Allow me to share insights and ensure your FPS payroll processing gets resolved.

In QuickBooks, submitting FPS to the HMRC, we'll have to ensure all payroll information entered is in its accurate details. Concerning your FPS submitted, which didn't get through to the HMRC, you can delete that FPS submission. Then, you'll need to roll back to the final payroll from the previous year.

Here's how to delete an FPS submission:

1. Go to Taxes, and select Payroll Tax.
2. Open the FPS submission you want to delete.
3. Select the bin icon.
4. Select Yes, remove to confirm.

Once done, the program will then generate a new FPS that you'll need to submit to the HMRC. Please ensure to keep note of all the payment details before doing this, as you'll need this information to recreate them in the future. 

For further steps and detailed information, you can refer to this article: Submit an FPS to HMRC in QuickBooks Online Standard Payroll.

Moreover, you'll want to visit this reference that will guide you on how you can view all your previous FPS submissions: View submitted FPS and EPS filings in QuickBooks Online Standard Payroll.

Let us know in the comments below if you require additional assistance submitting FPS filings. We'll be right here, willing to help. Keep safe!