I have a problem with the Admin Generator. The Table of Pages have the column sf_guard_user_id. The rest of the table looks as this part of the generator.yml in the line display,

list:
  title: Pages
  display:      [=title, sfGuardUser, views, state, privacy, created_at, updated_at]
  sort:         [created_at, desc]
  fields:
    sfGuardUser: { label: Author }
    created_at:  { label: Published, date_format: dd.MM.y }
    updated_at:  { label: Updated, date_format: dd.MM.y }
  table_method: retrieveUserList

Now the sf_guard_user_id is been replaced and the username ist displayed. Don't get me wrong, that works fine. But how can I get other variables from the sfGuarsUser relation? When I only add salt or another variable to display I get this,

Unknown record property / related component "salt" on "simplePage"

But why?