I was unable to reproduce the behavior following the [Advanced Operations - Importing SOAP Web services](https://community.denodo.com/tutorials/browse/basics/3adv1ws) tutorial.
You might want to check whether you have double-clicked the [Array] to check if there is data inside the array?
I am able to see two records after I double-click on [Array] in the return field for customer_id = ‘C003’ condition.
I would also recommend to check the Execution Trace in the Query Results tab, to check if there was any error during fetching the data.
Hope this helps!