Sorry, I post this again to send this as reply to all other members of this thread

>If i use CURVAL or OLDVAL, both return correct value and I can know the changes, but It need to loop through all of the fields.
>
>
>Any ideas?

Whats the problem? This operation is quick because it works with buffered data in memory. Sample of updating session with checking for changes on the server:

if !tableupdate(.F.,.F.) && when cannot update, check if reason is changes on server
  local lnFieldIndex, lcFieldName
  select MyAlias
  for m.lnFieldIndex = 1 to FCOUNT()
    m.lcFieldName = Field(m.lnFieldIndex)
    if type(m.lcFieldName) == 'G' && skip general fields
      if !(OldVal(m.lcFieldName) == CURVAL(m.lcFieldName))
        * Oops - something changed on the server by another user - prompt to overwrite
        ...
        if !llOverWrite && if user answered to do not overwrite
          && update current value by changed value from server
          replace (m.lcFieldName) with CURVAL(m.lcFieldName)
        endif
      endif
    endif
  ENDFOR
  * WARNING - special checking for deleted records
  if CURVAL('Deleted()')
    * Oops - record already deleted by another user
    * ask to recover it or keep deleted
    ...
    if llRecover && if user answered to recover record
      && following 2 commands needed to assure correct update on server
      delete
      recall
    else
      && delete record in local buffer as well
      delete
    endif
  endif
  
  if !tableupdate(.T.,.F.)
    && error - cannot update at all
  endif
endif