Originally Posted by
kaka
What you need to do to ticket for your upgrade is to give MPO a YBHK-class ticket number (to prove u've got an eligible ticket & the fact that you've got a ticket confirmed on that flight* for ur upgrade). The original booking (the K-class ticket having a deadline on 9 Mar, in your case) has nothing to do with the upgrade at this point.
If OP does not ticket the underlying class, what ticket number can OP give MPC to confirm the upgrade?