I have no idea what Augusto's response is, but I ran into this error when I had forgotten to set the keyfields property for the table I was working with
=cursorsetprop("keyfields", "keyfield1, keyfield2")

>Olá Ricardo,
>
> Eu já tive esse problema. No meu caso isso ocorreu porque a chave primária não estava com a opção updatable (símbolo de um lápis em view designer/update criteria). Você tem certeza que estas chaves são atualizáveis?
>
>Um abraço,
>Augusto
>>Hi friends,
>>
>>I have a problem with remote views (table buffering):
>>i'm trying to do a TABLEUPDATE(.t., .t.) on a remote view that has all fields updatable (even primary). SQL Server gives me an error saying that i can't insert data because my primary field is null. And, if i make a BROWSE before the TABLEUPDATE, that field has data.
>>
>>Any ideas?
>>
>>Ricardo