24X would generally bar clearly erroneous review of overnight trades inside 20% bands
In a notice dated 10 Nov, 24X National Exchange said it would amend its clearly erroneous executions rule so that, once Overnight Price Bands are in place, a trade executed during LULD Protected Hours "will not be reviewable as clearly erroneous" except in limited circumstances. The change would become operative at the start of 23/5 trading, scheduled for 6 Dec.