Go to the General Ledger -> General Ledger Reports -> Financial Report Writer (KF4000), use the Look Up icon to enter the Cust Code and Report Key.
Click on the Columns (KF4001) button, click next to the Seq box and use the Zoom icon.
The Zoom icon will pull up the Report Column Definitions (KF4016) screen. Here the user can make adjustments to Column Headings, Width, Periods, etc. When finished click OK all the way out.