CUSDEC — EDIFACT Customs Declaration Message (D.18B)

The CUSDEC message is the customs declaration sent by a declarant to a customs administration for import or export: detailed declaration of goods, value, origin, customs regime and associated duties. It is one of the largest EDIFACT messages. This page summarises the segment structure as published by UN/CEFACT for directory D.18B.

Purpose

The CUSDEC message is the customs declaration sent by a declarant to a customs administration for import or export: detailed declaration of goods, value, origin, customs regime and associated duties. It is one of the largest EDIFACT messages.

This page focuses on the structure published by UN/CEFACT for directory D.18B. The segments listed, their status (M / C), position and repetition factor are extracted from the official file cusdec_c.htm hosted on service.unece.org.

Segment structure

The CUSDEC D.18B message has 47 header entries, 160 detail entries and 10 summary entries (segments and groups combined). Groups are shown in bold and their members are indented by actual nesting depth.

Header

Detail

Summary

Changes vs D.96A

Top-level differences between D.96A and D.18B for the CUSDEC message (segments directly inside header / detail / summary, ignoring nested groups). The comparison is indicative: a given tag may have evolved inside nested groups without showing up in this synthesis.

Segments added vs D.96A

• GEI in the header section (status C, repeat ×25) — not present at the top of the corresponding D.96A section.
• EFI in the header section (status M, repeat ×1) — not present at the top of the corresponding D.96A section.
• CED in the header section (status C, repeat ×99) — not present at the top of the corresponding D.96A section.
• QTY in the header section (status C, repeat ×9) — not present at the top of the corresponding D.96A section.
• PYT in the detail section (status M, repeat ×1) — not present at the top of the corresponding D.96A section.
• GEI in the detail section (status C, repeat ×99) — not present at the top of the corresponding D.96A section.
• EFI in the detail section (status M, repeat ×1) — not present at the top of the corresponding D.96A section.
• CED in the detail section (status C, repeat ×99) — not present at the top of the corresponding D.96A section.
• COM in the detail section (status C, repeat ×9) — not present at the top of the corresponding D.96A section.
• GEI in the summary section (status C, repeat ×1) — not present at the top of the corresponding D.96A section.

Segments removed vs D.96A

• GIS in the header section — present in D.96A but missing in D.18B at the same level.
• PAT in the detail section — present in D.96A but missing in D.18B at the same level.
• GIS in the detail section — present in D.96A but missing in D.18B at the same level.
• GIS in the summary section — present in D.96A but missing in D.18B at the same level.

Max-repeat changes

• FTX (header): repeat ×1 in D.96A → ×99 in D.18B.

Structural example

Minimal example of an CUSDEC D.18B message with mandatory segments only. The goal is to show the exact version declared in UNH (CUSDEC:D:18B:UN) — not to replicate a full business case (see the CUSDEC D.96A page for an annotated example).

UNB+UNOC:3+5410000000123:14+5410000000456:14+260514:1430+CTRL018001'
UNH+1+CUSDEC:D:18B:UN'
BGM+929+CUSDEC-2026-7811+9'
DTM+137:20260514:102'
NAD+CZ+5410000000123::9'
NAD+EX+5410000000456::9'
CST+1+850430:NCM:FR'
MOA+38:42500.00:EUR'
LOC+27+FR::ISO'
LOC+28+CN::ISO'
UNT+9+1'
UNZ+1+CTRL018001'

Common errors

• Misaligned UNH tokens — The UNH+...+CUSDEC:D:18B:UN token must reflect exactly the directory in use — a mismatch between the UNH release and the release agreed with the partner is rejected by every strict validator.
• Wrong UNT segment count — The value after UNT+ must include UNH and UNT themselves. By far the most common sender-side error, regardless of the directory in use.
• Stale code lists — Between D.96A and D.18B, several code lists received new qualifiers (DTM status, RFF qualifier, NAD codes…). Reusing an older directory’s code tables triggers warnings or even rejections depending on the partner’s strict-conformance mode.

Related messages

Other versions of this message available on ediverse.io: CUSDEC D.96A, CUSDEC D.01B, CUSDEC D.10A, CUSDEC D.16B, CUSDEC D.21B, CUSDEC D.24A, CUSDEC D.97A, CUSDEC D.99B, CUSDEC D.00B, CUSDEC D.02B, CUSDEC D.05A, CUSDEC D.08A, CUSDEC D.13B, CUSDEC D.20B.

X12 functional equivalent: X12 309.

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