It rebate under sec 24b for provisional possession

I took a home loan from HDFC in April 2011 and my flat was under construction till date in Noida, my builder has offered for provisional possession in Jan 2015 (for fitouts) as completion certificates are presently not being issued by NOIDA due to NGT issue and subsequently sub-lease deed can also not be executed as of now. My questions are 1. Can i claim rebate for interest under section 24 b from this FY (2014-15) after payment of all dues of the builder & taking this provisional possession for fitout in this FY 2. What are the exact documents needed to prove the completion of construction or possession, mentioned in section 24b of IT act, to claim IT rebate for ineterest ? Consider the property to be self -occupied for this FY