No worries
I was able to make it work.
Thanks anyway!
=======================
$criteria=new CDbCriteria;
$criteria->with = 'centers';
$criteria->together = true;
$criteria->compare('centers.center_number', $this->device_id, true);
$criteria->compare('type',$this->type);
$criteria->compare('manufacturer',$this->manufacturer);
$criteria->compare('management_ip',
($this->inetAtoN($this->management_ip)) ? $this->inetAtoN($this->management_ip) : '', true);
$criteria->order = 'centers.center_number ASC,