# Changelog for version 1.11.0

### New features & improvements

- Added new ContractDocumentReference class & tag cac:ContractDocumentReference to Invoice — Thanks [@mabjavaid](https://github.com/mabjavaid)
- Remove duplicate validation for `id` on invoice — Thanks [@mabjavaid](https://github.com/mabjavaid)
- Added new cac:PartyIdentification tag to cac:Party
