old_contents: from django.contrib import admin
  from work.models import *
  from valuenetwork.valueaccounting.actions import export_as_csv
  
  admin.site.add_action(export_as_csv, 'export_selected objects')
  
  admin.site.register(MembershipRequest)
  
new_contents: from django.contrib import admin
  from work.models import *
  from valuenetwork.valueaccounting.actions import export_as_csv
  
  admin.site.add_action(export_as_csv, 'export_selected objects')
  
  class MembershipRequestAdmin(admin.ModelAdmin):
      list_display = ('name', 'agent', )
      
  admin.site.register(MembershipRequest, MembershipRequestAdmin)
  
subject: add agent to admin MembershipRequest display fields