Something wrong

public function withTotals() {
        $criteria = new CDbCriteria;
        $criteria->alias = $this->alias;
        $criteria->together = true;
        $criteria->with = array(
            'sales' => array('alias' => 'sls'),
            'quotationDetails' => array('alias'=>'qd'),
        );

        $criteria->select = array("*",
            "ROUND(SUM(qd.selling_price * qd.quantity),2) as totalAmount",
            "ROUND(SUM(qd.selling_price * qd.quantity)*(1-($this->alias.discount/100)),2) as totalDiscountedAmount",
            "ROUND(SUM(qd.selling_price * qd.quantity)*(1-($this->alias.discount/100))*(1+($this->alias.tax/100)),2) as totalTaxedAmount",
            "SUM(sls.amount) as totalSalesCredited",
        );
        $criteria->group = "$this->alias.id";
        $this->getDbCriteria()->mergeWith($criteria);
        return $this;
    }