A code indicating acknowledgement, or rejection (the action taken) of a subject interchange, or part of the subject interchange, or indication of interchange receipt.
The corresponding referenced-level and all its lower referenced-levels are rejected. One or more errors are reported at this reporting-level or a lower reporting- level.
5
UNB/UNZ accepted
6
UNB/UNZ rejected
7
This level acknowledged, next lower level acknowledged if not explicitly rejected
The corresponding referenced-level is acknowledged. All messages or functional groups at the next lower referenced-level are acknowledged except those explicitly reported as rejected at the next lower reporting-level in this CONTRL message.
8
Interchange received
Indication of interchange receipt implies that the recipient of the subject interchange: has received the interchange; and acknowledges the parts of the interchange that have been checked in order to assure that the data elements copied into the reporting UCI segment are syntactically correct; and has accepted liability for notifying the sender of acknowledgement or rejection of the other parts of the interchange; and has taken reasonable precautions in order to ensure that the sender is so notified.