TYPO3 Core

It works if the following TypoScript code is used:

file.import.data = levelmedia: -1,slide
file.treatIdAsReference = 1

It's in the TSref 6.0 (which has not been released yet)

Ticket can be closed

To get the current page's media and slide from it's parents you need:

uid.data = leveluid:-1, slide

But the bug still (6.1.3) exists: "slide" does not work in this case...

temp.headerimage = FILES
temp.headerimage {
  references {
    table = pages
    uid.data = leveluid:-1, slide
    fieldName = media
  }
  renderObj = COA
  renderObj {
    10 = IMAGE
    10 {
      file.import.data = file:current:publicUrl
    }
  }
}

@Ben: I think leveluid:-1 doesn't make any sense since it returns the page uid of the current page. IMHO there's always a uid and it will not slide higher in the tree. levelmedia-1, slide should do it. In my case it returns a whole bunch of comma separated uids (file references). This also doesn't make any sense. So I suggest levelmedia is not working in current TYPO3 6.2beta5.

lib.logo = FILES
lib.logo {
references {
table = pages
uid.data = leveluid:-1, slide
fieldName = tx_extension_additional_field_in_pages_table
}

renderObj = COA
    renderObj {
        10 = TEXT
        10 {
            data = file:current:publicUrl
        }
    }
}

also doesn't work.