Multi page reference

Hi! I've created a field to save links to internal pages in my site, this way:

      fields:
        header.filmography:
          type: pages
          size: medium
          classes: fancy
          style: vertical
          label: Filmography
          show_all: false
          show_modular: false
          show_root: false
          help: PLUGIN_ADMIN.HOME_PAGE_HELP
          multiple: true

The point is that when I put multiple: true it doesn't work, but, then I remove it it works and the field is saved into the md file.

And another question: Is it possible to filter by page template?

Thanks in advance!

What appears in the md file for this field is this:

filmography: Array

Also, tried with a list, and the result is the same... It seems it cannot save arrays properly :(

Fixed adding validate and array :)