Hi Sameer.
Go to OBC4 choose account group from accounts that you are using, then change the status field of profit center to Opt. entry. After go to OB41 choose the posting key and change he status field of profit center to Opt. entry too.
If you prefer you can also create a "z" of account group example Z067, and assign it as account group of account you are using and make in it the change needed.
Regards
Jandoval Nascimento.