>>
>>Then wouldn't just a simple IF (VARTYPE(OLDVAL(FIELD(i))<>VARTYPE(EVALUATE(FIELD(i))) be sufficient, or do you need to know when character (or other type) value changes, too?
>
>No, this would not work for me. The comparison should work on many different fields. Some fields will change the value but the type will be still be the same. The above expression will not pick up those cases.

See FieldChanged function from the message link I gave you. (at the bottom of the message).