UA Expert shows all references, regardless of what they are for. So, it does not care.
Client programs that are specialized to display the stuff they are interested in need to do some filtering. And that is what is happening.

The customer should show my analysis to Aveva/Citect/Schneider and tell them to fix their software.

Regards

Hello.
With the browsing dialog(s), the answer is negative. The "Browse for OPC-UA Data" dialog intentionally shows a specialized subset of the address space, a "view" filtered to show just Objects and Variables. To do so, it relies on proper server behavior. It cannot be changed.

Programmatic browsing (calling BrowseXXXX) would work well, because there you can specify any kind of filtering - but that's not what you are asking for, I understand.

Regards

Hello.

The server has a "HasChild" reference from the the "BrowseProvider" to the "Cluster1" node, as can be seen on your UaExpert screenshot:



Because "HasChild" is an abstract reference type, having such reference is a violation of the OPC UA specification. Only concrete reference types can appear in the address space (for example, in this case, "HasComponent" will work).

See:
- reference.opcfoundation.org/Core/Part3/v104/docs/7.5 : "The HasChild ReferenceType is an abstract ReferenceType; only subtypes of it can be used. "
and
- reference.opcfoundation.org/Core/Part3/v104/docs/5.3.2 : "The IsAbstract Attribute indicates if the ReferenceType is abstract. Abstract ReferenceTypes cannot be instantiated ..."
and
- reference.opcfoundation.org/Core/Part3/v104/docs/5.5.1 : "HasComponent References identify the DataVariables, the Methods and Objects contained in the Object."

Regards