Zone Groups SOAP API help

It looks like in v12.5 zone groups should be available in the SOAP API, but I can't seem to get it working.

In the new documentation: "In V12.5, zone_group and zone_group_desc have been added to the Price dataset in the GetPerformanceDetail and GetPackageDetail methods." In the sample data, there are some sample nodes:<zone_group>1</zone_group>
<zone_group_desc>Main Floor</zone_group_desc>

Has anyone gotten this working? I did the following:

* Added some Zone Groups in TR_ZONE_GROUP

* In Facility Manager-->{Facility}-->Zone Maps-->{Map}, I mapped several Prize Zones to some of the Zone Groups.

When I make a request to something like GetPerformanceDetail, I see the nodes in the schema, but not in the actual dataset:

Schema:
<xs:element name="zone_group" type="xs:int" minOccurs="0"/><xs:element name="zone_group_desc" type="xs:string" minOccurs="0"/>

 

Dataset sample:
<AllPrice diffgr:id="AllPrice5" msdata:rowOrder="4">
<zone_no>9861</zone_no>
<price_type>52</price_type>
<price>159.7500</price>
<base_price>159.7500</base_price>
<description>Orchestra A rear</description>
<
available>Y</available>
<avail_count>30</avail_count>
<price_type_desc>OP S Duet</price_type_desc>
<rank>5</rank>
</AllPrice>

I would expect to see it here, but it's MIA. Is there another configuration step that I'm missing to get this working?  Any help would be appreciated.