Hi Bhaskar,
A possibility is to update PA segment during creation of line items in the user exit COPA0005. There you can transfer value from structure T_ACCIT to whatever field of line item , i.e. also to CHARG. There is advantage, that you will have directly filled characteristic CHARG, so line item and it's profitability segment will be with CHARG. Possible disadvantage could be, that profitability segment assigned to FI posting will be without this information. In case of the exit COPA0005 would be good to restrict such update just for certain business transaction, in order to prevent some conflict for other postings to CO-PA, e.g. from SD. Then for MB1A it could be: IF T_ACCIT-AWTYP = 'MKPF' AND T_ACCIT-VORGN = 'RMWA'. * do update ENDIF.