Web Services Connection Profile dialog doesn't provide guidance when CP has no valid Teiid connection properties

I'm trying to replicate the Weather example using Designer.

I created (generated?) the invoke procedure and modeled a view whose transformation SQL contains the XML parsing constructs used in the example.

I created a connection profile as part of defining the data source. This process involves the Web Services Data Source dialog (see screenshot). For this I entered the URL as the SOAP endpoint. Al other field were left blank. Test connection returned a success message, yet when I exited the dialog, the resulting profile was in error "There are no valid Teiid connection properties associated with this connection profile". (See the other screenshot.)

Perhaps this is evidence of an underlying bug, but it represents a usability issue since it doesn't clearly explain what's missing or incorrect.