fix bug in change_exchange_type
fix bug in change_exchange_type

django-rea/nrp,valnet/valuenetwork,valnet/valuenetwork,FreedomCoop/valuenetwork,valnet/valuenetwork,FreedomCoop/valuenetwork,FreedomCoop/valuenetwork,django-rea/nrp,django-rea/nrp,valnet/valuenetwork,FreedomCoop/valuenetwork,django-rea/nrp