What is in Field 5 of the MSGID?

What is in Field 5 of the MSGID?

• A. CHG-ATO issued with subsequent changes
• B. ATO original
• C. MSGID revision
• D. ACP status

Answer: (A)

Field 5 shows the status of changes to the Authorization to Operate. When it indicates a CHG-ATO issued with subsequent changes, it means the message is a change to the original ATO and that additional updates followed after that change was issued. This tells you that you’re not looking at the original ATO, but at a change package that itself has been updated with later changes. The other possibilities describe different things: the original ATO would be the first issuance with no changes yet; a MSGID revision would refer to changes to the message identifier itself, not the ATO changes; ACP status refers to a different attribute entirely and does not describe changes to the ATO.

Field 5 shows the status of changes to the Authorization to Operate. When it indicates a CHG-ATO issued with subsequent changes, it means the message is a change to the original ATO and that additional updates followed after that change was issued. This tells you that you’re not looking at the original ATO, but at a change package that itself has been updated with later changes.

The other possibilities describe different things: the original ATO would be the first issuance with no changes yet; a MSGID revision would refer to changes to the message identifier itself, not the ATO changes; ACP status refers to a different attribute entirely and does not describe changes to the ATO.