Issues Testing Load Balancer Nodes - SoapUI throwing an illegalArgumentException

I am currently having issues with testing both of the load balancer nodes.

LoadBalancer: https://test_x.example.com:1990/

Node Y: https://test_y.example.com:1990/

Node Z: https://test_z.example.com:1990/

In SoapUI (5.2) I can test the load balancer endpoint. Successfully.

But when I change the endpoint to point to one of the Nodes.

I get an illegalArgumentException. Name must not be null.

I have tested it on other Soapui version (4.5.X) and it is the same issue

When I use a different tool like Postman to hit the node Y or Z, it works fine.

Has anyone experienced this issue before with SoapUI Free Version.?

I have also noticed that the raw request is missing.

When you hover over the endpoint it says 'no endpoint' even though I have the Node Y Endpoint specified.

Cheers

Jona.