Unfortunately, we are confronted with a problem of having too many 'experts' in this forum! Everyone seems to think that he or she has to contribute his/her two cents' worth without bothering about the consequences, especially the adverse effect it has on the young and growing HR professionals by giving them wrong information.
May I request all to understand the difference between the law, the industry norms, and the practice in your organizations - past or present. While the law is sacrosanct and the industry norms constitute desirable practices, what your organization follows need not be the right policy - even if it was started by an expert who was or is heading your HR department. Also, except where it is legally binding due to the fact that it is laid down in an Act or Law governing your company and hence is binding (e.g., Shops and Establishments Act, Payment of Gratuity Act, Provident Fund rules, etc.), your organization is free to frame its own rules and regulations in matters like notice period and cash in lieu of notice. What is important is that the employee, while accepting the offer of employment, should be made aware of such internal rules by inclusion in the appointment letter and must accept them (by signing the letter).
As HR professionals, what we must ensure is that any such provisions also meet the principles of natural justice. Thus, if you pay your employees only the basic pay when he or she encashes the accumulated leave, it is only logical that you recover basic pay only against a deficient notice period as well. The same goes for the payment against the notice period from the employer's side if the company is terminating the services of an employee.
It would be nice if those who claim that certain provisions are given elsewhere (like on the webpage of HRD Ministry, etc.) also provide the link to it, or at least personally check and satisfy themselves that the same is true before making such a claim.
I have taken the liberty of writing such a long post only because I am shocked to see the amount of misinformation posted by the self-proclaimed experts here. Please do not take it as a personal attack against any individual(s) who contribute to this forum.