public function changeshipping()
    {
        $oSession = $this->getSession();

        $oBasket = $oSession->getBasket();
        $oBasket->setShipping(null);
        $oBasket->onUpdate();
        $oSession->setVariable('sShipSet', \OxidEsales\Eshop\Core\Registry::getConfig()->getRequestParameter('sShipSet'));
    }