QB Issue Resolution:

Basic or Enhanced open the paycheck detail, if rate is exactly the same change the pay type and save.  You only have to unlock net if you are changing net.

Resolution for Issue 'how can I adjust regular pay to holiday pay on a past payroll check in history?' available: Yes (Solved).
Source: Intuit Community forum.

how can I adjust regular pay to holiday pay on a past payroll check in history?: 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.

Support for holiday pay
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Error Recovery for holiday pay [Canada]
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Additional Support Options: