DESCRIPTION: This is a multiple field used to monitor the lines within the routine. For the last/date time entry, all lines of the routine are present in numerical order from the top of the routine (line 1 is the first line of the
routine) to the last line of the routine.
Changes to the routines are retained under the lines where the changes were made, including a copy of the original line and the revised line. Insertions of one or more lines are included in the line entry WHICH FOLLOWS
the inserted code. All other lines which are not changed are deleted.