Updating query subjects
If you are using a relational data source, you can choose to update only the query subjects instead of performing a full project synchronization. You must perform a project synchronization to synchronize changes in another data source.
The query subject is updated based on the definition in the data source. When you update a query subject, new metadata is fetched from the data source and query items are re-synchronized.
You can also evaluate the query subject, if it is from a relational data source Validating query subjects.
You cannot use the Update Object command for model query subjects.