fix bug in error message
diff --git a/xos/tosca/resources/service.py b/xos/tosca/resources/service.py
index db3c86a..884c6db 100644
--- a/xos/tosca/resources/service.py
+++ b/xos/tosca/resources/service.py
@@ -21,7 +21,7 @@
 
             existing_tenancy = CoarseTenant.get_tenant_objects().filter(provider_service = provider_service, subscriber_service = obj)
             if existing_tenancy:
-                self.info("Tenancy relationship from %s to %s already exists" % (str(service), str(provider_service)))
+                self.info("Tenancy relationship from %s to %s already exists" % (str(obj), str(provider_service)))
             else:
                 tenancy = CoarseTenant(provider_service = provider_service,
                                        subscriber_service = obj)