My service began as Asst. Professor in NCERT from 9-1-2003 with 5th CPC pay scale Rs. 8000-275-13500/-. I applied for Senior Scientist post in ICAR, through proper channel. Up on my selection, my parent organization relieved me (w.e.f. 20-08-2008 AN) and I joined ICAR on 21-8-2008 in PB -3 with Grade pay Rs.8000/-. My past service rendered at NCERT was counted in ICAR. Later, I was promoted in ICAR to PB-4 with Grade pay 9000/- w.e.f. 21-8-2011. Now I got another promotion as Principal Scientist (PB-4 with Grade pay 10000/-) w.e.f. 21-8-2014. I have been asked by my office to exercise option for pay fixation. Please suggest, is it worthy to request my office to fix my pay from the date of my promotion i.e. 21-8-2014.