Currently when a refund is processed the refunded amount is NOT deducted from the client's total sales—perhaps because at the moment it can only be processed via a Credit Note—so the client overview gives incorrect information. I don't know whether it is also incorrectly reflected in overall sales, haven't had the time to confirm that yet.

This also wastes time (and is frustratingly redundant) when different users have to dig into invoices, credit notes etc. to see if a refund has in fact been processed.