What are the difference between : Retroactive Accounting Period, Earliest Retroactive Accounting Period!

Retroactive Acc Period: The retroactive accounting period refers either to an individual employee or to a payroll area. The earliest possible retroactive accounting period is specified for a payrollarea. The system also takes into consideration the employee\\\'s initial entrydate.

Earliest Retroactive Acc\\\'g Period: The period furthest back in the past for which it is still possible toperform a retroactive accounting run. This means that retroactive accounting takes place for a period for which payroll has already been performed.