openproject/app/views/hooks/_view_issues_show_details_bottom.rhtml

<%-
def summarized_cost_entries(cost_entries)
  last_cost_type = ""

  result = cost_entries.sort_by(&:id).inject(Hash.new) do |result, entry|
    if entry.cost_type.id.to_s == last_cost_type
      result[last_cost_type][:units] += entry.units
    else
      last_cost_type = entry.cost_type.id.to_s

      result[last_cost_type] = {}
      result[last_cost_type][:units] = entry.units
      result[last_cost_type][:unit] = entry.cost_type.unit
      result[last_cost_type][:unit_plural] = entry.cost_type.unit_plural
    end
    result
  end

  return "-" if result.empty?

  str_array = []
  options = {:class => 'icon icon-box'}
  result.each do |k, v|
    str_array << link_to(pluralize(v[:units], v[:unit], v[:unit_plural]), {:controller => 'costlog', :action => 'details', :project_id => @issue.project, :issue_id => @issue, :cost_type_id => k}, options)
    options = {} # options apply only for first element
  end
  str_array.join(", ")
end
-%>

<% if @project.module_enabled? :costs_module %>
  <%# Only render this partial, if the plugin is enabled for the current project %>
  <tr>
    <td><b><%= l(:label_cost_object) %>:</b></td>
    <td><% if @issue.cost_object.nil? %>-<%else%><%= link_to h(@issue.cost_object.subject), {:controller => "cost_objects", :action => "show", :id => @issue.cost_object} %><% end %></td>
    <% if User.current.allowed_to?(:view_cost_entries, @project) %>
    <td><b><%= l(:label_spent_units) %>:</b></td>
    <td>
      <%= summarized_cost_entries(@issue.cost_entries) %>
    </td>
    <% end %>
  </tr>
  <% if User.current.allowed_to?(:view_unit_price, @project) && User.current.allowed_to?(:view_all_rates, @project)%>
    <tr>
      <td>&nbsp;</td>
      <td>&nbsp;</td>
      <td><b><%= l(:label_overall_costs) %>:</b></td>
      <td><% if @issue.overall_costs > 0 %><%= link_to number_to_currency(@issue.overall_costs), {:controller => 'costlog', :action => 'details', :project_id => @issue.project, :issue_id => @issue}, :class => 'icon icon-money' %><% else %>-<%end%></td>
    </tr>
  <% end %>
<% end %>