prBAS CEN/TS 17011-3:2026

This document describes: - the rationale for building customisation supporting business cases that are specific to their business environment while maintaining organisational and semantic interoperability with the TC 440 specifications; - the difference between Usage specification and Extension specification; - a methodology on how to define customisations on: - BII Transaction specification, - Business rules, - Code lists; - how to claim compliance or conformance to a customisation of a TC 440 specification; - the connection to the eProcurement Ontology project. This specification does not describe the detailed process of building an extension.