Yii MANY_MANY on clause - database

Question

I have the following tables in my database.
subscriber(
subscriber_id int,
status char(1),
...
)
sendlist(
sendlist_id int,
...
)
subscriber_list(
subscriber_id int,
sendlist_id int,
status char(1)
)
in my SendList model I have a relation defined as follows:
'Subscribers'=>array(self::MANY_MANY, 'Subscriber', 'subscriber_list(sendlist_id, subscriber_id)',"on"=>"Subscribers_Subscribers.status='a' and Subscribers.status='a'")
I have tried setting both the on and condition clause, and one or the other, however the sole Subscriber in the table at present (linked to this sendlist) is ALWAYS returned, regardless of whether it's status in the subscriber table, or the subscriber_list table is set to 's'.
When I check the DB - the query that the join supposedly gives something along the lines of:
SELECT `Subscribers`.`subscriber_id` AS `t1_c0`, `Subscribers`.`full_phone` AS `t1_c1`, `Subscribers`.`status` AS `t1_c2`, `Subscribers`.`contact` AS `t1_c3`, `Subscribers`.`client_id` AS `t1_c4`, `Subscribers`.`date_joined` AS `t1_c5` FROM `subscriber` `Subscribers`
INNER JOIN `subscriber_list` `Subscribers_Subscribers` ON (`Subscribers_Subscribers`.`sendlist_id`=7075) AND (`Subscribers`.`subscriber_id`=`Subscribers_Subscribers`.`subscriber_id`) AND (Subscribers.status='a' and Subscribers_Subscribers.status='a')
WHERE (Subscribers.status='a' and Subscribers_Subscribers.status='a');
returns an empty set (as it should). But when I print_r the $list->Subscribers array, I get the following:
Array(
[0] => Subscriber Object
(
...
[_attributes:CActiveRecord:private] => Array
(
[subscriber_id] => 2043221
[full_phone] => 447944426885
[status] => s
[contact] => 0
[client_id] => 14002
[date_joined] =>
)
so it recognises that the subscriber is status 's', but still loads it!
The code that causes the issue is here:
$client = new Client();
$client->save(false);
//ensure that we are working with a clean subscriber set.
$subscribers = Subscriber::model()->findAll();
foreach($subscribers as $subscriber){
$subscriber->delete();
}
//create a new subscriber with a set of filter options.
$subscriber = new Subscriber();
$subscriber->client_id = $client->client_id;
$subscriber->full_phone = "44712345678";
$subscriber->country = "England";
$subscriber->gender = "Male";
$subscriber->save(false);
//create a new list with a set of matching options
$list = new SendList();
$list->client_id = $client->client_id;
$list->gender = "=Male";
$list->save(false);
//confirm that the subscriber can be added to the list.
self::assertTrue($list->canImport($subscriber));
$list->import();
//confirm that the subscriber has been added to the list.
self::assertEquals(1, $list->active_subscriber_count);
self::assertEquals(1, sizeof($list->Subscribers));
//remove all subscribers (set status to 's')
$list->remove();
//check that the list no longer records the subscribers presence.
self::assertEquals(0, $list->active_subscriber_count);
self::assertEquals(1, $list->stopped_subscriber_count);
//check that the subscriber has no lists associated with it.
$subscriber->refresh();
self::assertEquals('s', $subscriber->status, sizeof($subscriber->SendLists));
//attempts to refresh the list. Tested without these with the same result.
$list_id = $list->sendlist_id;
unset($list);
unset($subscriber);
$list2 = SendList::model()->findByPk($list_id);
$list2->refresh();
//check that the the list has no subscribers - this fails.
self::assertEquals(0, sizeof($list2->Subscribers));
Have I missed something silly?