piklist-filter-piklist_empty_post_title

<?php
 
  // Set the Post Title to "Order #" plus post ID:
  function set_post_title_to_order_number($data, $post_array)
  {
    if ($post_array['post_type'] == 'MY-POST-TYPE')
    { 
      return 'Order #' . $post_array['ID'];
    }
    else
    {
      return $data;
    }
  
  }
  add_filter('piklist_empty_post_title', 'set_post_title_to_order_number', 10, 2);