Use metric set query hints
The Advanced (Query Hints) section of the metric set's settings dialog provides advanced settings that are relevant to the current metric set. For example, when working with OLAP, you can set a preference for using NON EMPTY instead of the default Nonempty() when generating MDX queries.
2. Prefer NON-EMPTY
Ensure that the metric set is checked out.
Open the Data Analysis Panel and click Edit.
In the dialog that appears, expand the Advanced (Query Hints) section.
Select Prefer NON-EMPTY to use NON EMPTY instead of Nonempty() when generating MDX queries (OLAP only).