This is a custom OData gateway service that I imported from a transport from a different system.
If I go to /n/iwfnd/maint_service
and try to delete the service it says:
Service cannot be deleted, delete ICF Node first
If I try to delete the ICF Node I get:
ICF node 'ZAPMEXTERNALDATA' could not be deleted.
Reason: 'Node is not in original system'