By mistake, the payroll was run for an employee who was on vacation. need the advice to cancel the transaction. it supposed to be processed tomorrow.

Hello vishnu2,

Your payroll is a vital part of your business. QuickBooks makes it simple to stay on top of your payroll making sure your staff gets paid on time. I'll be happy to steer you towards the right path with this. 

Making mistakes while processing your payroll is common. Depending on how you processed the payroll, you can delete the pay cheque using the steps below: 

1. Go to Employees or Payroll.
2. Under the Run payroll button, select Pay cheque list.
3. Select the cheque to delete and click Delete.
4. When prompted to confirm the action, select Yes or No.

I highly recommend checking out this helpful article with more info on: How to delete a pay cheque. This article will walk you through the necessary steps required to correct payroll on your account. 

In case you have other question, don't hesitate to reach back to me in the comments below. I'm here to help you achieve your QuickBooks goals. If I don't hear back from you, I wish you a prosperous 2021!