Hi,
The OData 4.0 service is used for accessing elements of the Denodo Platform. As of now, you can perform the filter condition on top of the normal fields but is not possible to apply the filter condition over elements of an array.
For more information, you may take look at the [Known Limation](https://community.denodo.com/docs/html/document/denodoconnects/8.0/Denodo%20OData4%20Custom%20Wrapper%20-%20User%20Manual) section of the Denodo OData4 Custom Wrapper - User Manual.
Hope this helps!