public static function RegisterActiveVariantForSpot($sSpotName, $sParentId, $sShopVariantArticleId)
    {
        if (!array_key_exists(TdbShop::SESSION_ACTIVE_VARIANT_ARRAY, $_SESSION)) {
            $_SESSION[TdbShop::SESSION_ACTIVE_VARIANT_ARRAY] = array();
        }
        if (!array_key_exists($sSpotName, $_SESSION[TdbShop::SESSION_ACTIVE_VARIANT_ARRAY])) {
            $_SESSION[TdbShop::SESSION_ACTIVE_VARIANT_ARRAY][$sSpotName] = array();
        }
        $_SESSION[TdbShop::SESSION_ACTIVE_VARIANT_ARRAY][$sSpotName][$sParentId] = $sShopVariantArticleId;
    }