本文件适用于CIU作为规范生产，目的是在适当的注册处注册。本文件还规定了创建EN 16931-1中定义的核心发票使用规范（CIU）过程中应采取的步骤的要求。此外，本文件为CIU的创建和实施提供了指导。以下几点是重点:-需要采取的步骤，以避免在使用CIUSs时不必要的扩散和分裂；-指导CIUSs的创建和实施，以质量控制为目标。应注意的是，计划将相同的原则和过程应用于单独文件中记录的扩展。

This document applies in case a CIUS is produced as a specification with the objective of registering it in the appropriate registry. This document also establishes requirements for the steps to be taken in the process of creating Core Invoice Usage Specifications (CIUS) as defined in EN 16931-1. Furthermore, this document provides guidance for the creation and implementation of a CIUS. The following points are the focus: - steps that need to be taken in consideration to avoid unnecessary proliferation and fragmentation in the use of CIUSs; - guidance on the creation and implementation of CIUSs, with a quality control objective. It should be noted that it is planned to apply the same principles and processes to extensions that are documented in a separate document.