Redmine/app/views/groups/_form.html.erb

<%= error_messages_for :group %>

<div class="box tabular">
  <p><%= f.text_field :lastname, :label => :field_name %></p>
  <% @group.custom_field_values.each do |value| %>
    <p><%= custom_field_tag_with_label :group, value %></p>
  <% end %>
</div>