Hi Will,

If you take a look at my example here, you can click the details and get the Primary Key within it.

https://www.labkey.org/home/Demos/ListExamples/project-begin.view?

My list has no additional metadata being used, just the addition of using that primary key as a column.

What version and build of LabKey are you running? Our labkey.org site is currently on 15.3 r41244.10 at the moment.

Regards,

Jon