perhaps some sample data would make things clearer

+---------+--------------------------------+--------------------+
| id      | description                    | rpt_key            |
+---------+--------------------------------+--------------------+
| ABC     | Organizational Detail Newer    | ABC.2013_10_18    |
| ABC     | Organizational Detail Older    | ABC.2012_10_15     |
| XYZ     | XYZ Status                     | XYZ.2012_08_05     |
| XYZ     | XYZ Status                     | XYZ.2012_08_12     |
| XYZ     | XYZ Status                     | XYZ.2013_08_14     |
+---------+--------------------------------+--------------------+
[download]

So the values I would want are:

ABC - Organizational Detail Newer
XYZ - XYZ Status
[download]