<base_category_list>
 <portal_type id="Purchase Invoice">
  <item>specialise</item>
 </portal_type>
 <portal_type id="Purchase Invoice Module">
  <item>business_application</item>
 </portal_type>
 <portal_type id="Sale Invoice">
  <item>specialise</item>
 </portal_type>
 <portal_type id="Sale Invoice Module">
  <item>business_application</item>
 </portal_type>
</base_category_list>