How to fetch Obis code of Instantaneous Profile

Hi,

I am trying to fetch the OBIS code (Logical Name) of the Instantaneous Profile using the following code. However, every time I execute it, I only get the values instead of the OBIS code. I have also tried using attributes 1 and 2, but I still receive only the values.

Could you please help me retrieve the OBIS code (Logical Name) correctly?

Here is my code

GXDLMSProfileGeneric profileGeneric = new GXDLMSProfileGeneric(obj.LogicalName);
// Define list of captured objects
var capturedObjectsList = new List<GXKeyValuePair<GXDLMSObject, GXDLMSCaptureObject>>();

// Define capture object
var c = new GXKeyValuePair<GXDLMSObject, GXDLMSCaptureObject>();
GXDLMSData gxobject = new GXDLMSData();
gxobject.LogicalName = obj.LogicalName;
GXDLMSCaptureObject captureObject = new GXDLMSCaptureObject();
captureObject.AttributeIndex = 3;
captureObject.DataIndex = 0;
c.Key = gxobject;
c.Value = captureObject;

// Add the capture object to the list
capturedObjectsList.Add(c);

// Assign the list to the profileGeneric object
profileGeneric.CaptureObjects = capturedObjectsList;
var a = Client.Settings.Objects.GetObjects(ObjectType.ProfileGeneric);

// Start reading
res = Client.ReadRowsByRange(profileGeneric, DateTime.Now.AddDays(-2), DateTime.Now.AddDays(-1), capturedObjectsList);
conn.ReadDataBlock(res, reply);

Every time I run this, I only receive the values, but I need to fetch the OBIS code (Logical Name) instead.

Thanks!