redmine/app/views/custom_fields/edit.html.erb

<%= custom_field_title @custom_field %>

<%= labelled_form_for :custom_field, @custom_field, :url => custom_field_path(@custom_field), :html => {:method => :put, :id => 'custom_field_form'} do |f| %>
<%= render :partial => 'form', :locals => { :f => f } %>
<% end %>