Originally Posted by
findark
It's because the fare was filed with an rbd of 'N'. Some of the systems use the actual fare rules for BE (changeability, primarily) and others use the rbd (upgrades, mileage earning).
Ah yes, my meaning was that I was not sure which was the mistake, the rbd of N or the use of non-BE rules for a BE price. Or is there a clear indication of which is the mistake? I suppose we can speculate about likelihood of one vs. the other.