We have Real time experts who has more than 10+ years of experience in Online Training. Acutesoft offers free Demo for SAP ESS-MSS Online Training. ESS - Employee Self Service is an web-site permitted tool useful to modify their very own data by the employee itself .MSS- Manager Self Service is an web allowed tool utilized for Managers to take report or improve the data of subordinate .To implement LEAVE REQUEST &APPROVAKL , both ESS and MSS are not compulsory . But ESS is necessary .However this capability is created to be available in MSS also if a client wants have both the ESS and MSS.