Redmine/app/views/custom_field_enumerations/create.js.erb

$('#errorExplanation').remove();

<% if @value.valid? %>
$('#content').html('<%= escape_javascript(render(:template => 'custom_field_enumerations/index')) %>');
<% else %>
$('form#add-element').prepend('<%= escape_javascript(error_messages_for(@value)) %>');
<% end %>

$('#custom_field_enumeration_name').focus();