The norms for the Foreign Portfolio Investors (FPIs) of government debt  was relaxed by the RBI on 6th October 2015.
In order to bring an additional 1.2 Lakh crore by March 2018 RBI declared higher investment limits in rupee terms in govt securities.
RBI also fix the FPI investment limits in rupee terms and increased the stages to reach 5% of the outstanding stock by march 2018.
For the current fiscal year ,In order to increase the limit for investment by FPIs in G-sec in two tranches ie from 12th october 2015 and 1st january 2016.
There is an increase in the limit ,ie
From october  12 – from Rs.1.53 lakh crore to Rs.1.7 lakh crore
From January 1 – Rs 1.86 lakh crore.
The operational guidelines relating to allocation and monitoring of limits is issued by the Securities and Exchange Board of India (SEBI).
Those Central Government securities in which aggregate investment by FPIs exceeds the prescribed threshold of 20% will be put in a negative investment list.
No fresh investments by FPIs in Central Government securities will be permitted till they are removed from the negative list.