You're not missing anything.  It has to do with the table lookup I believe -
changevalue doesn't work the same way.  What you have to do is trap in the
unlockrecord action and compare the 'new' value to the old value. basically,
read the underlying table before posting the new data.

Here's what I tried out - just a routine that demonstrates how you can see
the "prev." value before the update occurs at the record level, since you
can't capture it at the field level.

At the form level do this:
method action(var eventInfo ActionEvent)
var
oldname string
endvar
if eventInfo.isPreFilter() then
 ;// This code executes for each object on the form:

else
 ;// This code executes only for the form:
 if eventinfo.id() = dataunlockrecord then
  oldname = blank()        ; init this fld
  if tc.locate(1,name) then    ; record key is called 'name'
   view(tc.attributes,"Old")        ; attributes is the fld I'm tracking
changes on - this displays the old value
   oldname = name        ; save the record key if we found a 'previous'
version
  endif
  dodefault        ; this will do the posting
  if oldname <> blank() then        ; make sure I had a prev. record - if
blank then I didn't
   if tc.locate(1,name) then        ; re-locate the old record
    view(tc.attributes,"new")    ; display the newly posted value
   endif
  endif
 endif
endif
endmethod

*****
Of course, there's probably some clever-er way of doing this, but I've not
found it.

Another way to approach this is to call a dialog form you design yourself,
rather than use the built-in lookup. You've already discovered one reason
to do this. Here's another, even better, reason: the path to the lookup
table is hard-coded in the table structure. If you ever change a directory
or drive, your table won't open. In Version 8, I've had this cause table
corruption and had to restore from a backup. (In later versions, moving
everything to the old locations worked, but not V8.)

--
Jim Hargan

-

Ryan,

You can get the changeValue triggered with this code in the object's Action
method:

if eventInfo.id() = DataLookup then
  self.action(EditCommitField)
endif

HTH,
Jim Moseley