See https://specifications.openehr.org/releases/AM/latest/AOM2.html#_authored_archetype_class and https://github.com/openEHR/specifications-ITS-BMM/blob/0003c592b2a74d6b3af21b0b43b3cc0e5e0ddd3c/components/AM/Release-2.3.0/openEHR_am_230.bmm#L219-L223 But the specification text says in [3.2.2. Machine Identifiers](https://specifications.openehr.org/releases/AM/development/AOM2.html#_machine_identifiers): > The `ARCHETYPE.build_uid` attribute is also optional, [...] So this should be checked with the SEC first. There is already a PR about this: https://openehr.atlassian.net/browse/SPECPR-366