Autopay with interim

We recently started processing payroll using autopay.  We needed to override a rate for someone who received a mid pay increase.  We did this by doing the hours at the old rate and hours at the new rate through the interim screen.  However, when we run pre-payroll JDE is also creating an additional 80 hours as a separate pay for that employee.  I know we can get around it by changing the employee to hourly, but this seems kind of cumbersome.  Anyone do it differently?

Thanks

Pam