procedure tmainfo.unitnamevalidate(Sender: TField);
begin
 with sender,lbufUnits do begin
  if find(0,vartostr(value),i1,true,nil) then begin
//   value:= newvalue;
   sender.clear; //<<<< HERE
   showmessage('Such unit name is already registered');
  end;
 end;
end;


2012/1/19, Martin Schreiber <mse00...@gmail.com>:
> On Thursday, 19. January 2012 14.20:59 IvankoB for-mse wrote:
>> Work , thanx !
>> But there's a little problem if the field is oe_notnull then me can't
>> call Field .Clear silently. What do You think about bypassing
>> oe_notnull check within OnValidate ?
>>
> Please more info.
>
> Martin
>
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