I am using the following code to try and pull a custom field value from the selected shipping address on a sales order.  I can see that the subrecord is successfully retrieved in the browser debugger, but I cannot figure out why it is returning an undefined value for custrecord_osi_route_code.  custrecord_osi_route_code is a custom dropdown list on the address record and there is definitely a value in the addresses I am selecting.  Even if I change the script to pick a default field like zip, it still returns an undefined value.  Any help is appreciated!