Hi Pavan,
I am not sure you are using the right exit. Since your exit is not filling it properly!
I would propose that below exit.
Include : MV45AFZB
form userexit_move_field_to_cobl using us_vbak structure vbak
us_vbap structure vbap
changing ch_cobl structure cobl.
cobl : is the coding block is having the profitablity segme fields. You need to fill it through the config values.
can you check