Query on tax exemption u/s 80ccd for nps tier1 account

Hi

I have issued a cheque of INR 50, 000 to my POP-SP on 20-Mar-2015 to open a NPS Tier1 account

The amount got debited from my bank account on the next day i.e., 21-Mar-2015

However due to various issues, POP-SP generated my PRAN number only during May’2015 and the units were credited during June’2015

As the amount got debited from my Bank Account during Mar'2015, please clarify if I can avail tax exemption for INR 50,000 during FY 2014-15 (AY 2015-16)

(Or)

As the PRAN Account got generated and Tier1 units credited during May/June'2015 only, I can avail tax exemption for INR 50,000 during FY 2015-16 (AY 2016-17)

Thanks