What is the difference b/w ce4xxxx_acct & CE4OPC1 in CO-PA- FICA integration

Hi Experts,

Need clarification on what basis Profitability segment will populate in CE4XXXX_ACCT table when costing based copa is activate . I cld see Profitability segments in CE4OPC1 table and same i'm not able to see in CE4OPC1_ACCT. but in CE4OPC1_ACCT there is a filed KEYCE4 value it updating Profitability segment number which is equal to CE4OPC1 proifitability segment number.

Thanks,

Abbas