Please see link for E-separation description and config details.
How is the E- Separation process in standard ESS? | SCN
For e-separation, it needs to be checked if it uses the ECC time eval, payroll, group cert, etc, instead of duplication.
On ECC or R/3, it provides a term'n workbench to complete termination including all payments (normal salary, term'n payments (like gratuity, VRS payments, payment for leave balance/accrual) calculated till separation date through simulated payroll using transactions entered till the txn exec date, printing group cert, actual termination with the corresponding pers.action; etc.
In both of the above, you need to complete config.