protected function HasValidShippingGroup()
    {
        $bHasValidShippingGroup = false;
        $oShipping = $this->GetActiveShippingGroup();
        if (!is_null($oShipping) && $oShipping->IsAvailable()) {
            $bHasValidShippingGroup = true;
        }

        return $bHasValidShippingGroup;
    }