Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
In a project that has Internationalization enabled, when a user tries to create a new derived attribute in a dossier in Web, an error appears when clicking Validate:

The following error can be found in the DSSErrors.log file: "Attribute form specified with an attribute was not found among the attribute's forms".
These are the steps to reproduce the issue:

This is a known issue in Web 2019 that is currently under investigation.
Contact Strategy Technical Support for an update on the status of this issue.
This issue does not occur when using the default language attribute form name instead.
This issue has been logged as TS316626 and DE136836. KB483306