Why is the employee's leave accrual not reflected on the periods' Leave Balance Breakdown window?

Why is the employee's leave accrual not reflected on the periods' Leave Balance Breakdown window?

This applies to all PaySpace editions.

Should an employee be linked to an interim run that is before the main run, the leave accrual will reflect under the interim run. 

      Navigate > Payroll Cycle > Payslip Pay Dates > Open Runs

      

      Navigate > Employee > Leave > Balances

      

The Main run -

      

The Interim run -