I analysed last 5 Years annual report in that under note 12. In standalone results and consolidated results they have mentioned it. But there is no consistency in reporting. I have taken a snapshot of this for your information.
http://www.bseindia.com/bseplus/AnnualReport/532143/5321430313.pdf (Pg.48)
I presented my understanding after some analysis if it wrong i am ready to correct it. I request boarders not to take any buying/selling based on my views.