Item ID in HummingBird CSV viewer

Hi every one,

I've noticed that HmmingBird CSV files view it with the CSV viewer, sometimes shows  Item ID's and sometimes does not. Is this an bug or is something I'm doing right. I'm creating panels with 4 to 6 pts, then everything is imported in revit. While the geometry seams fine in revit, the builder it does returns an error.

So what is this Item ID, how it gets created (it has nothing to do with the objects name rhino)

How is possible that an object that has no Item ID gets imported fine into revit.

I'm very new to HummingBird

Thank you all

Claudio