Hi,
The view parameter feature is only available in the full license of Denodo Platform. When you use express License, you cannot set view parameters in a derived view. For more information refer the user manual [Denodo Express License](https://community.denodo.com/docs/html/browse/6.0/platform/installation/appendix/limitations_of_the_denodo_express_license/limitations_of_the_denodo_express_license#limitations-of-the-denodo-express-license)
I would recommend you to use the Full Denodo License to be able to use this feature of view parameter, however, to create the view “dv_product_by_category_simple” view in the lab exercise, view parameter is not required. You will need to project the Base view input parameter ‘parameter.categoryname’ to convert it in a simple field and rename it as ‘input’.
Hope this helps!