ESS node missing in IMG

Hi,

We have ECC 6.0 EHP4 and SAP-HR and EA-HR are on EHP4 SP20. We have not activated EA-HR and using HR for payroll for a while. We are planning to implement ESS/MSS solution based on EHP4. We are unable to see the node "Employee Self-Service" under img>>Personnel management

Is there anything need to be activated to enable Employee Self-Service node? From my understanding we don't need to activate EA-HR unless and until we use EA-HR features. We also do not want to try activating EA-HR since we cannot roll back.

We are planning to start with "Leave Request" and "Payslip" services only for ESS at this stage.

Appreciate you help here.

Thanks

Siva