In a report group description, the COLUMN NUMBER clause identifies a
  printable item and specifies the position of the item on a print line.
  In a screen description, the COLUMN NUMBER clause specifies the
  horizontal screen coordinate for a screen item.

1 - 1format_report_description

  Format 1 - Report Description

   COLUMN NUMBER IS column-num

 1.1 - column-num

   is a positive integer greater than zero.

2 - 2format_screen_description

  Format 2 - Screen Description

   COLUMN NUMBER IS [PLUS] { identifier-1 }
                           { integer-1    }

 2.1 - identifier-1

  is an elementary unsigned numeric integer data item.  It cannot be
  subscripted.

 2.2 - integer-1

  is an unsigned integer value.