We need to add 2 more columns in existing EPM books in one sheet ,so total columns 15

EPM BPC Books ,trying add 2 new columns in existing reports in each sheet ,total become 15 ,last 2 columns getting truncated while publishing the report.Please advise where to make setting change so that one sheet having 12 columns and second sheet having 15 columns in same report.Please advise.

We are using EPM SP28 version .BPC 10.1 classic on HANA .

Thanks in advance .