Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
After upgrading to Strategy 2019, when editing a dataset for a dossier you may run into a notification that asks if you want to continue editing your dataset (Edit Dataset) or keep changes local (Keep Changes Local).

If you select Keep Changes Local the following error may appear:

To reproduce one of the scenarios that causes this error message:
This error message is caused when two cube instances contain two different versions of the DBMS. After upgrading to Strategy 2019, the driver shipped by Strategy is also updated. So when trying to keep changes local, the server will try to duplicate the real cube instance.
To resolve this error, republish the cube based on this database instance. KB483212