No message after scanning when person still needs to pay and is already scanned

When you scan a ticket of someone that hasn't paid the full amount but the person is already checked in, the system only tells you the person is already checked in at time X instead of again showing that the person still has to pay.This scenario could happen when somebody at the entrance claims he has paid "and the system is just bugged so please rescan"

Bottom line: the to pay message should have priority on the already checked in message.