Business Interoperability Interfaces for Public Procurement in Europe - Architecture - Part 101: Conformance and Customization Methodology guideline
The scope of this document is to define the conformance principles to BII specifications and to describe the methodology that shall be used to create customizations in order to allow flexibility to user communities while preserving interoperability among them to the greatest possible extent. However, when dealing with e-Invoicing, customizations must retain full conformance with the EN as will be defined by CEN PC 434. This means they cannot include any restrictions or extensions which will mean they cannot be interoperable with any of the syntaxes produced from the EN.
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