Hi Kartik,
You have to extend your periodicity for 2016.
First you have to de-initialize the planning area with t.code /SAPAPO/TSDEINIT. Then you will be able to change the periodicity (2016). Save and then re-initialize planning area with t.code /SAPAPO/TSINIT.
Hope that can help you!.
Thanks.
Regrads, Marius