When the user persists the following diagram:

..with the following Decision Table:

.. select the "Can drink beer?" header, set the default value as false and the file:

<dmn:outputValues id="_A117F7DC-508C-4132-8F5F-8F8F2B0B489F">
<dmn:text>false</dmn:text>
</dmn:outputValues>
<dmn:defaultOutputEntry id="_A4881AD1-7EDC-4B4D-AC00-078626795BA7" typeRef="string">
<dmn:text></dmn:text>
</dmn:defaultOutputEntry>

..and the expected behaviour is to persist the value false in the defaultOutputEntry.