Incoming references should be displayed on the node-edit screen as well as the node-view page - patch here.

I've got a reasonably complex family of node type relationships. I can get the editors to deal with the idea that in order to edit certain complex data, they have to edit it on the incoming (referring) node, not the target node that they are looking at.
But - it's therefore neccessary that they can get to the referrer nodes when looking to edit the target node.

I can display the incoming references on node view, that works fine, and is what the module does well.
But if the editor hits 'edit' the edit screen simply doesn't show those incoming properties, even in read-only mode, and it's disconcerting plus not-usable for them.

I hit into the code, and found that all we really have to do is provide a 'widget' for the nodereference field type. It doesn't have to be a working widget like #667224: Allow the reference field to be edited, but it should be something. In the first case, a list of links to the incoming references.

Code was easy, and comes out clean : like this:

/**
 * Display incoming nodereferrers on an edit form. They can't be edited here,
 * but can be at least listed
 * 
 * Implimentation of hook_widget. Defines the appearance of this field type on
 * the node edit form.
 */
function nodereferrer_widget(&$form, &$form_state, $field, $items, $delta = 0) {
  if ($field['widget']['type'] == 'nodereferrer_list') {
    $output = array(
      '#title' => $field['widget']['label'],
      '#type' => 'fieldset',
    );
    // $items is always a list - a list that contains a list of incoming referrers.
    // So - display the list, using the default formatter.
    foreach ($items as $i => $item) {
      $info = array('#item' =>  $item);
      $output[$i] = array(
        '#type' => 'markup',
        '#value' => theme('nodereferrer_formatter_default', $info),
      );
    }
    return $output;
  }
}