Pay Increases based on System Date and not Effective Date

We process payroll biweekly.  A salaried employee recieves a raise midway through the current 14-day pay cycle and management would like the pay increase to be effective from the beginning of the pay cycle.  HR enters the increased pay rate and enters an effective date equal to day-1 of the current pay cycle.

When payroll is processed, JDE will apply the employee's old rate from day-1 to the actual system date the rate was applied then apply the new rate from the system date to the end of the pay cycle.  In effect, JDE is ignoring the effective date entry.