Originally Posted by
Kiwi Flyer
In my experience even if the QF website displays both business and first class options it will not actually let you select first one way and business the other. There is logic in the website booking engine that greys out the class for the return flights that is opposite the class selected for the outbound flights.
I've seen it do that but I was able to select Business Saver and First Sale today and continue to payment page. May not do it for all dates/routes but it certainly does sometimes.
Worth checking, entering the lower class in the search.