Creating decision tables in Red Hat Decision Central not reflecting complex types / structures

I have a DMN decision created in Decision Manager 7.3. I have a few data types created, all of which are "structures" (i.e. complex types) with nested fields. I have created a decision table of which the condition column is bound to one of these structures (Customer) and the output column is bound to a Result structure.

However, I would expect the column headers to reflect the structure of the objects as per the example here (step 9 onwards): https://access.redhat.com/documentation/en-us/red_hat_decision_manager/7.3/html-single/designing_a_decision_service_using_dmn_models/index#dmn-data-types-defining-proc_dmn-models

In the documentation example, the Loan_Qualification type has nested fields and these are shown as sub-columns in the table header.

My data types are defined as follows:

I have a Customer input node and a decision node defined as follows:

Yet in my decision table, the columns map to the top level object only as follows:

So any ideas as to what I might be missing? Thanks in advance.

UPDATE I have used the answer given below by @karreiro which works for the outcome / action column, but inserting an Input Clause left or right adds a new top level column, not a sub column, which then looks like the following:

Is this something you expect the decision table editor to be able to do as well?

Your expectations are correct.

The DMN editor aims to support the auto-creation of fields for Structure Data Types (for output clauses https://issues.jboss.org/browse/DROOLS-3685, and input clauses https://issues.jboss.org/browse/DROOLS-4491).

However, momentarily, users need to create these fields manually:

See how to create here :-)