DI: Changing StampNum in the Delivery Note

Hi all,

I've got a problem to change a field StampNum in the Delivery Note from AddOn. There's no sach a property for the BusinessObject (oDocument). I've tried to make it SQL connection. It works, but if I try to edit the Delivery Note from the form, I get the error message about another user who's changed the table. Is there any legal way to edit fields which has no properties in the appropriate Business Object?

Best regards,

Mark