fixed in AS pull #72

app/views/active_scaffold_overrides/_horizontal_subform_header.html.erb

@@ -1,13 +0,0 @@
-<%# use correct ACL https://github.com/activescaffold/active_scaffold/pull/72 %>
-
-<thead>
-  <tr>
-    <%
-    active_scaffold_config_for(record.class).subform.columns.each :for => record.class, :crud_type => :read, :flatten => true do |column|
-      hidden = column_renders_as(column) == :hidden
-      next unless in_subform?(column, parent_record)
-      -%>
-      <th class="<%= "#{'required' if column.required?} #{'hidden' if hidden}" %>"><label><%= column.label unless hidden %></label></th>
-    <% end -%>
-  </tr>
-</thead>