You make changes to the catalog by bulkloading, either adding new data or modifying existing data. For example, you could add new part classes, attributes, or custom interfaces.
The bulkload process generates the views for the catalog database for the added items.
If you run the Synchronize Model with Catalog command in Project Management, the model views are regenerated. However, if you do not synchronize with the model, the model views are not regenerated to match the catalog changes. Use the View Generator to regenerate the model views.
After regenerating the model views, use Edit > Regenerate Reports Database to update the reports and reports schema databases with the changes.