confusing about Simultaneous-Use (still)

[Trio Yulistianto]

hi all im using Freeradius-1.1.6, with mysql database.i'm still confusing
about simultaneous-use.
i want to limiting the maximum number of simultaneous logons ( just 1
session can login for every 1 user in a same time)
this is my radiusd.conf

session {
        sql
}
and this is my database :
mysql> select * from radcheck where username='dara at idola';
+----+-----------------+---------------------------+----+--------------+
| id | UserName   | Attribute               | op | Value      |
+----+-----------------+----------------------------+----+-------------+
| 55 | dara at idola | Password             | == | denpasar |
| 65 | dara at idola | Simultaneous-Use | :=  | 1            |
+----+-----------------+---------------------------+----+--------------+
2 rows in set (0.00 sec)
mysql>  select username,acctstoptime from radacct where
username='dara at idola' and acctstoptime=0;
+----------------+-------------------------------+
| username   | acctstoptime             |
+----------------+--------------------------------+
| dara at idola | 0000-00-00 00:00:00  |
+-----------------+-------------------------------+
1 row in set (0.00 sec)

with that config and data rows, user dara at idola can login for second session
:(
any help expected

thanks
trio
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