Yes UTS app is zone specific till now.. U cannot book a ticket from like say BALLY/ KONNAGAR/SRIRAMPUR Stn. in ER to MCA/BAGNAN/KGP stn in SER directly because of 2 zones u have to book 2 tickets, 1 from BALLY to HWH and another from HWH to KGP using UTS App. But work is going on in IR to overcome this may be in comming months it will be possible