Interesting DP - booked LH F in a haste with Lifemiles. Immediately realized this wasn't the 747 (one of my remaining bucket list experiences along with the FRA F experience) and called to cancel within 2 minutes, fully prepared to pay the $200 fee for my mistake. For whatever reason, they didn't charge me the $200 fee. Maybe because the reservation may not have been ticketed yet?
Edit - and the miles were back in my account by then end of the call.