anchor.diff:    <div class="control-group">
       <%= f.label :primary_connection_id, :class => 'control-label' %>
       <div class="controls">
  -      <%= f.select :primary_connection_id, Logan::Application.config.connection_mappings.collect{|i| [i.first.to_s.humanize, i.last] }, :class => 'text_field' %>
  +      <%= f.select :primary_connection_id, Logan::Application.config.connection_mappings.collect{|i| [i.first.to_s.humanize, i.last] }, :class => 'text_field', :include_blank => true %>
       </div>
     </div>
     <div class="control-group">
  
positive.code:   <div class="control-group">
      <%= f.label :primary_device_id, :class => 'control-label' %>
      <div class="controls">
        <%= f.select :primary_device_id, Logan::Application.config.device_mappings.collect{|i| [i.first, i.last] } , :class => 'text_field' %>
      </div>
    </div>
    <div class="control-group">
  
negative.code:   <div class="control-group">
      <%= f.label :secondary_device_id, :class => 'control-label' %>
      <div class="controls">
        <%= f.select :secondary_device_id, Logan::Application.config.device_mappings.collect{|i| [i.first, i.last] }, :class => 'text_field', :include_blank => true %>
      </div>
    </div>
    <div class="control-group">
  