how can I create ACCT_BUDAT into COPA account based data source?

hi Friends,

I create a COPA data source use standard BI function: KEB0 and find that the posting data(ACCT_BUDAT ) can not include into it.

I checked the table CE4xxxx_acct and find that it has already in it, however when I check tcode KEQ3 I found that this field is not in the list.

So can anybody tell me the reason and advice? the posting data is important for the report. Also if possible, may I include the COPA document number into the COPA account based datasource?

thanks very much!