HABTM with an extra field (saving)

I have an issue where my HABTM save isn't quite working. I mean it
is, but it's throwing a few notices to Cake, which I'm concerned
about:
Notice (8): Undefined index: id [CORE/cake/libs/model/model.php, line
1391]
Notice (8): Undefined index: id [CORE/cake/libs/model/model.php, line
1329]

I know if I turn off debug, these messages won't show but still, it's
a cause for concern for me.

So I have 3 tables in total...

reviews table:
id
title
(more fields, but irrelevant)

criterias table
id
title
(more fields but irrelevant)

and a joining table, which is HABTM

criteria_review table
criteria_id
review_id
value *

* that's the extra field I'm talking about.

now, in my view code, I copied the way the standard automagic multi-
select named stuff and came up with this:

<?php echo $this->Form->input('Criteria.Criteria.'.
$i.'.criteria_id', array('label' => false, 'type'=>'hidden', 'value'=>
$key)); ?>
<?php echo $this->Form->input('Criteria.Criteria.'.$i.'.value',
array('label' => false, 'type'=>'select', 'options'=>array('1'=>'1 out
of 5','2'=>'2 out of 5','3'=>'3 out of 5','4'=>'4 out of 5','5'=>'5
out of 5'))); ?>

It saves ok, but it throws those notices up there. Any ideas on what
I'm doing wrong or what could be causing that?

Or if you have a better way to deal with EXACTLY what I'm going thru,
please, by all means, explain your way.

Thanks,
Jake

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