>>If that works for you, that's fine, but I find your example extremely hard to follow its intent.
>>
>>

>>IF (VARTYPE(OLDVAL(FIELD(i))<>VARTYPE(EVALUATE(FIELD(i)))
>>  *
>>  * To/From .NULL.
>>  *
>>ELSE
>>  *
>>  * Type stays the same
>>  *
>>  IF ISNULL(EVALUATE(FIELD(i))) OR (OLDVAL(EVALUATE(FIELD(i))==EVALUATE(FIELD(i)))
>>    *
>>    * same values
>>    *
>>  ELSE
>>    *
>>    * different values
>>    *
>>  ENDIF
>>ENDIF

>>
>>All in all, they're really the same thing.
>
>No, your code is not the same as Dmitry's and it doesn't test all conditions.

How so?