Editing $this->data within model's custom validation method

Hello

In cake 1.2, I have a custom validation method.

Within this method, if a certain condition is met, I want to force the
value of $this->data['Site']['name'] to 'test' simply by <?php $this-
>data['Site']['name'] = 'test'; ?>.

My problem is the value of $this->data['Site']['name'] doesn't change.
Is it possible to change the value like this?

Thanks
Turgs
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