openproject/app/views/hooks/_view_issues_context_menu_end.rhtml

<% 
possible_cost_objects = issues.inject(issues.first.project.cost_objects) do |intersect, issue|
  issue.project.cost_objects & intersect
end
%>
  <li class="folder">
	<a href="#" class="submenu"><%= l(:cost_objects_title) %></a>
	<ul>
	<% unless possible_cost_objects.empty? -%>
		<% possible_cost_objects.each do |co| -%>
		    <li>  
		      <%= context_menu_link co.subject, {:controller => 'issues', :action => 'bulk_edit', :ids => issues.collect(&:id), 'cost_object_id' => co, :back_url => back}, :method => :post,
		                              :selected => (@issue && co == @issue.cost_object), :disabled => !can[:edit] %>
		    </li>
		<% end -%>
	<% else -%>
	  <li><%= l(:notice_cost_object_conflict)%></li>
	<% end -%>
	</ul>
</li>