Issue/Symptom/Question

Unable to delete the standard rate for a pay rate in the Payroll Class

Applies To

Payroll > Setup > Payroll Classes

If you experience this issue here are your options:

Please log a Service Desk ticket providing Payroll class and Pay rates that need deleted.
if the fields are white, manually key over the values, you'll have to manually calculate the time and 1/2 and double time rates, however that should be simple
lastly, and this may be less feasible, enter a new effective date one day greater than the current date and re-enter the amounts. This would only be a workable solution if the rates you're entering are in the past (vs. future dated pay rate changes).