My company would like to stop users from creating credit notes for more than the original invoice value, when the credit memo is referenced to an invoice. E.g. invoice is for $100, then multiple credit notes can be created, e.g. for $50, $30, and $30. Total credited = $110, but the original invoice was only for $100.
there doesnt seem to be a standard message which can be issued under these circumstances in order to stop the users from doing this. Does anyone have any advice on how to stop this?