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Standards

CIUS

A CIUS (Core Invoice Usage Specification) is a national or sector-specific tightening of EN 16931: it may make fields mandatory or narrow value ranges, but never add new ones — XRechnung is the German CIUS.

Also:
Core Invoice Usage Specification
Reviewed on 2026-08-26.

There is no long-form article for this term yet. The definition above is the complete entry; the related terms lead onwards.