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'
Here's how I got it resolved.
To delete the service:
Goto TCODE: SE03
Choose IWSG and IWOM with “ZAPM*” as shown below. ( the start of the name of your service ) You can see in the image below that they are "SAP Gateway: Service" and "SAP Gateway: Model M..."