app/views/spree/admin/promotion_codes/new.html.erb
<%= render :partial => 'spree/admin/shared/error_messages', :locals => { :target => @promotion_code } %>
<%= form_for [:admin, @promotion, @promotion_code] do |f| %>
<div class="well">
<fieldset data-hook="admin_promotion_code_new_form">
<legend><%= Spree.t(:new_promotion_code) %></legend>
<%= render :partial => 'form', :locals => { :f => f } %>
<%= render :partial => 'spree/admin/shared/new_resource_links' %>
</fieldset>
</div>
<% end %>