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CIUS

Country or sector specific usage specification that constrains EN 16931.

Definition

Country or sector specific usage specification that constrains EN 16931.

Why this term matters

A CIUS turns the base EN 16931 model into rules for a country, sector, or network. XRechnung, Peppol BIS Billing 3.0, NLCIUS, and OIOUBL are examples. The wrong profile or CustomizationID can cause validation or delivery failure, so confirm the recipient’s required profile.

Explanation

CIUS rules typically tighten cardinalities, enforce identifiers, or restrict code lists.

XRechnung is a well-known CIUS for Germany (B2G).

Common mistakes

  • Sending an EN 16931 generic CustomizationID (urn:cen.eu:en16931:2017) when the recipient expects a CIUS-specific URN (e.g., #compliant#urn:fdc:peppol.eu:2017:poacc:billing:3.0).
  • Declaring one profile while treating an unrelated CIUS as if it also applied. Use an official joint profile when one exists.
  • Validating only with EN 16931 Schematron — CIUS-specific rules (BR-DE, BR-NL, BR-IT) are additional and not part of the base ruleset.
  • Treating an Extension and a CIUS as interchangeable — Extensions add new BTs while CIUSes restrict existing ones.

Frequently asked questions

Can a single invoice satisfy multiple CIUSes?

A document declares one applicable CustomizationID. It can conform to base EN 16931 through that profile, but do not combine unrelated CIUS rule sets. Use a joint profile only when its owner publishes a specific CustomizationID for it.

How do I know which CIUS a recipient requires?

In Peppol, the recipient publishes accepted document types and customization IDs in their SMP entry. Outside Peppol, the recipient typically documents the requirement on a supplier-onboarding portal or in tender documents.

Where is the CustomizationID located in the XML?

In UBL it is cbc:CustomizationID at document root. In CII it is rsm:ExchangedDocumentContext/ram:GuidelineSpecifiedDocumentContextParameter/ram:ID. Both are top-level and one of the first elements a recipient parses.