You must use the manual catalog creation procedures to create a Unicode-enabled OLAP Metadata Catalog, as described in Creating, Upgrading, and Deleting OLAP Metadata Catalogs.
Drill-through operations are not supported on a Unicode Essbase database.
Integration Services does not support Unicode databases in Microsoft SQL Server RDBMS.
If the database is UTF-8 but you are using only one language, select the UTF-8 option from the Code Page drop-down list whenever you access the database with the Login, OLAP Metadata Catalog Setup, Set Login Defaults, and Data Source dialog boxes.