Wim:

I had to make changes on the fly, so I clear the contents
of the expr field before build, and add what I need before printing.
In my case, I needed to set the number of copies without having to
resort to the printer dialog box.
Try this:

sele 0
use report.frx exclu
copy to temp.frx
use
use temp.frx alias metafile
sele metafile
replace metafile.expr with "ORIENTATION=1"
use

then print.

Luke