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| AB |
| Message acknowledgement |
| Indicates that an acknowledgement relating to receipt of message is required. |
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| AC |
| Acknowledge - with detail and change |
| Acknowledge complete including changes. |
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| AI |
| Acknowledge only changes |
| Acknowledgement of changes only is required. |
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| NA |
| No acknowledgement needed |
| Specifies that no acknowledgement is needed in response to this message. |
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