SIS released a version 2.1 of the YAML and a new version of the specification. This mostly targets discrepancies between the specification and YAML.
We are currently working on updating to comply with the new requirements. The new changes are according to the versioning non-breaking but there are some changes to attributes that could cause problems if those attributes are in use (the change of spelling in variable titleEngish to titleEnglish) and if there are solutions that have tight restrictions on Enums (dutyCodes).
We are planing to release this in the coming weeks and therefore just want to raise attention to the fact that this is in development.