Yamaha O2R Owner's Manual page 315

Digital I/O, Setup, and Utilities 205
Shown below is the SCENE 5/5 page—24bit Recording Mode.
If you attempt to set 24bit MODE when the Input
Patch for a slot is assigned one or more buses, the
confirmation dialog box shown here appears.
Choose EXECUTE to cancel the Input Patching
and activate 24bit MODE.
02R User's Guide