How to back out FPL changes on GNX-480?

It never ceases to amaze me how I keep finding something I don't know how
to do on the GNX-480 after all this time.

Had a flight plan going when I got a pretty significant re-route in flight.
I went into FPL, hit EDIT, and started deleting waypoints with the CLR
button. After a while, I realized I had deleted more than I wanted to, and
that's where I got stuck.

I know the newly edited flight plan isn't activated until you hit EXEC.
But is there any way to just throw away what you've got in the edit buffer
and revert back to the last executed flight plan to start editing again
from there? The best I could come up with was to re-enter the waypoints I
had accidentally deleted, then enter the new ones, then hit EXEC.