Not the answer I was hoping for but thanks nonetheless.
So it may be worth a shot? If I add my EC # to the booking and it gives no miles I should be able to retro claim with FB; or should I try to have no FF # in the booking and manually claim with EC first?
Presuming this is that MAN AF error fare to SYD, why don't you put it all to FB? Much easier and surely you'll have a substantial chunk of miles given that the AF metal will be going there anyways!
Much easier than having to faff about with EC in this case...