Kelas Message

00XX = Reserved for ISO use

01XX = Authorization messages

02XX = Financial transaction messages

03XX = File update messages

04XX = Reversal messages

05XX = Reconciliation control messages

06XX = Administrative messages

07XX = Reserved for ISO use

08XX = Network management messages

09XX-79XX = Reserved for ISO use

80XX-89XX = Reserved for national use

90XX-99XX = Reserved for private use