Map Reduce with dotted property names

I am running a map/reduce against a saved search on a sales order.  The problem is the saved search results include a joined record field.  When the JSON is viewed in the map function there is a dotted property name.  How can I access this field.

Here is the JSON:

    "recordType": "salesorder",      "id": "123",      "values": {          "tranid": "SO12345",          "custbody_salesorderreadytobuildref": "F",          "entity": {              "value": "9876",              "text": "Joe Tester (joe.tester@example.com)"          },          "custbody_readytobuild.applyingTransaction": "F",          "internalid.applyingTransaction": {              "value": "5678",              "text": "5678"          }      }

I want to get the value of custbody_readytobuild.applyingTransaction  but it contains a dot in the name.

Here is what I am trying to do but it obviously doesn't work.