> On event before post this works well.
>
> What about compare fieldbyname('xx').OldAsString with
> fieldbyname('xx').AsString.
>

Yes, but, this must work in OnValidate Event.
I have :
if (afield.fieldname='p') then
p1:=....
if (afield.fieldname='p1') then
p:=....

When You change one field manually then OnValidate event change other and
OnValidate is again execute.
I want some propertie or some like which tell me that is field changed by
OnValidate.
I can use global variable , but...

Teo