Hello Anushka,
Like Suneeta mentioned, your use of vague & unheard-of terms ["self termination"] in your opening posting confuses things.
Coming to your situation, just follow the rules of the company & the terms as mentioned in the Offer/Appointment Letter to this employee. This seems to be a clearcut case of an employee not serving the Full tenure of the Notice Period and, presumably, not handing-over properly. Where's/what's the hold-up?
Rgds,
TS