What's the sense of confirmation field in COMMAND_LONG

From Mavlink command microservice flowchart I understood that ‘confirmation’ field should be used to verify/signal the retransmission of a command (I’m assuming in case of a loss of ACK) but I don’t understand how to identify which command have been retransmitted … i.e. if I send a serie of similar commands (same command id) which are only partially acknowledged how I can understand which of them is being retransmitted ? Of course I’m assuming that SEQ is continuosly incremented so it will be different among all these messages…