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UCD |
| Data element error indication |
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To identify an erroneous simple, composite or component data element, and to identify the nature of the error. |
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UCF |
| Functional group response |
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To identify a functional group in the subject interchange and to indicate acknowledgement or rejection (action taken) of the UNG and UNE segments, and to identify any error related to these segments. Depending on the action code, it may also indicate the action taken on the messages within that functional group. |
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UCI |
| Interchange response |
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To identify the subject interchange, to indicate interchange receipt, to indicate acknowledgement or rejection (action taken) of the UNA, UNB and UNZ segments, and to identify any error related to these segments. Depending on the action code, it may also indicate the action taken on the functional groups and messages within that interchange. |
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UCM |
| Message response |
| |
To identify a message in the subject interchange, and to indicate that message's acknowledgement or rejection (action taken), and to identify any error related to the UNH and UNT segments. |
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UCS |
| Segment error indication |
| |
To identify either a segment containing an error or a missing segment, and to identify any error related to the complete segment. |
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| |
UNA |
| Service string advice |
| |
To define the characters selected for use as delimiters and indicators in the rest of the interchange that follows. |
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UNB |
| Interchange header |
| |
To start, identify and specify an interchange. |
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UNE |
| Functional group trailer |
| |
To end and check the completeness of a functional group. |
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UNG |
| Functional group header |
| |
To head, identify and specify a functional group. |
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UNH |
| Message header |
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To head, identify and specify a message. |
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UNS |
| Section control |
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To separate header, detail and summary sections of a message. |
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UNT |
| Message trailer |
| |
To end and check the completeness of a message. |
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| |
UNZ |
| Interchange trailer |
| |
To end and check the completeness of an interchange. |
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