It is not possible to pay an employee using the same pay type twice in one pay period.  If an additional check needs to be issued:

  1.  Assign the employee an additional pay type to be used for the adjustment, and schedule this pay type to be paid on 1 period end date.
  2. If the pay type defined in step 1 is an hourly or piece rate, create a time and attendance batch for the correct amount.
  3. Create the payroll calculations using the period end date for the pay type defined in step 1, and only select to create the calculation for this employee.