I maintain an application that creates Notes calendar entries, via the C API. I have a case where I am creating a repeating calendar entry. I do this by creating two documents, a parent and a child. The resulting meeting looks fine, as far as recurrence and other data. The problem I have is that it cannot be modified (rescheduled or deleted). I get the error message "you must select an instance document to perform these actions". I have read the IBM technote on this error message, but I don't really understand how it would apply to me, with regards to what modifications I need to make to the parent or child documents. As far as I can tell, the entries that I create are identical to those created natively in the Notes client, but I don't have this problem with the native document. Can anybody shed some light on this problem?