Hi,
The error message “Error in select view conditions: Field not found ‘iv_derived_vw.i_id’ in view ‘iv_derived_vw’” occurred because the field i_id defined iv_derived_vw is not found. In general, if the view parameter does not have a default value, then the Virtual DataPort would generate a union query by providing the obligatory field with each of the possible values. But when there is a default value, the view parameter becomes not OBL, so a union is not generated.
For more information, you can have a look at the document [Creating Union Views](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_derived_views/creating_union_views/creating_union_views#creating-union-views) and [Parameters of Derived Views](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_derived_views/creating_selection_views/creating_selection_views#parameters-of-derived-views) of the Virtual DataPort Administration Guide.
Hope this helps!