Originally Posted by
oliver2002
Mileage & evoucher upgrades can be reversed, but you need the original fare booking class to be available to from I/O to whatever you have earlier.
my question was actually if the agree to a direct swap of miles to evouchers. If I ask for a refund and a new upgrade with evouchers, there is a chance that I end up on WL and never get it, especially for J to F.