We want to use the id of users for our invoicing. I've been able to display the user id field in lists and on the logout screen without any problems.
However, we also need to be able to search users based on the id to match the invoice back to the user (Don't ask me why we're not just using names!).
I've tried creating a custom html field, with content [user_id], but this field is not searchable.
I've tried adding [user_id] to a normal text field, and making that searchable, but nothing is returned from the search.