Issue trying to get Object Number

I have yet another DXL question.  I have a script that loops through the objects in a baseline.  Within this loop, I am trying to get the System attribute Object Number, but when I run the script I get an error saying that it's an unknown Object attribute.  Is this attribute protected for some reason?  I'm able to get the Absolute Number, so I figured I should be able to get the Object Number.

Here's the snippet of my code (bm2 is the module I retrieve earlier in the script):

for oObj in document(bm2) do {
    int absNum = oObj."Absolute Number";
    string objNum = oObj."Object Number";
    
    //Do some stuff with the object based on the values above.
}

The error occurs on the 2nd line in the for loop: unknown Object attribute(Object Number).

Chris Cote

Re: Issue trying to get Object Number
DOORSHAM - Fri Oct 28 15:45:31 EDT 2016

try:   number  oObj