Composite keys with ActiveScaffold in Ruby On Rails

ActionView::TemplateError (Could not find column contact,type) on line #3 of ven
dor/plugins/active_scaffold/frontends/default/views/_form.rhtml:
1: <ol class="form" <%= 'style="display: none;"' if columns.collapsed -%>>
2:   <% columns.each :for => @record do |column| -%>
3:   <% if is_subsection? column -%>
4:   <li class="sub-section">
5:     <h5><%= column.label %> (<%= link_to_visibility_toggle(:default_visible =
> !column.collapsed) -%>)</h5>
6:     <%= render :partial => 'form', :locals => { :columns => column } %>

vendor/plugins/active_scaffold/lib/data_structures/sorting.rb:16:in `add'

set_primary_keys :contact, :type