I can't use table buffering because I'm working with a framework that "impose" row buffering in this situation.
I was thinking about not to execute GOTO RECNO(parent) IN (parent) when adding a new record, but I have to check if APPEND BLANK itself refesh the relation.
(I need the relation because of an "Attachment" button on my form that turns red when the current record has attachment(s) and looks black otherwise).

I never thought about SET KEY or SET SKIP TO.
Let me check them out...

Thank you
Nicola