QB Issue Resolution:

You have to contact Payroll support for this. They only let you remove the most current paychecks. Anything in a closed period will need to be addressed differently.

Resolution for Issue 'I posted payroll for an employee. I want to change the payment amount. I can only delete the most current payroll paychecks. How delete the paychecks I have posted?' available: Yes (Solved).
Source: Intuit Community forum.

I posted payroll for an employee. I want to change the payment amount. I can only delete the most current payroll paychecks. How delete the paychecks I have posted?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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