Originally Posted by SLF
Perceived wisdom here is not to use open dated sectors; if in doubt simply make dated bookings towards the end of the 12 month ticket validity period. For OWE tickets, date changes are free, so once you know the real dates you can simply pull it forwards. Best not to use an open dated sector for a variety of reasons.
I think some of us here would disagree with these statements. See, e.g.,
this post and
this post and
this thread for a discussion.