Originally Posted by
1Aturnleft
The LH website now seems to allow you to choose whether you'd like a ticket that can be used out of sequence in a similar way the BA site allows you to choose whether you'd like flexibility. I've not had time to draw comparisons on the fares being quoted there but I'd be as bold as to suggest opting for a ticket that can be used out of sequence will cost more than one that cannot.
I'm pretty sure that checking that box prices the itinerary as full fare one way tickets (YY fare basis) so you could then use them in any order. So for a Vienna-Frankfurt-Amsterdam return ticket, you're buying four separate flexible one ways. Even then, if you simply no-show without cancelling, I think you loose the value of that segment.