Hey Rick,
This to me means that the service itself was not created in /IWFND/MAINT_SERVICE. There should be a ZGBAPP_**APPROVAL in the Service Catalog when you go into the transaction. When you select them, the ICF node for ODATA should be green and the System Alias should be populated. Mine though, do not have a namespace associated with them. I'm not 100% that they need a namespace. One thing that you could try is to delete the service and re-create it. But if you do this, you will also need to delete the corresponding SICF service before recreating it. It would be under /sap/opu/odata/sap/gbapp_**approval, where the stars are either PO or PR.
I found this too about System Aliases: http://scn.sap.com/docs/DOC-62040
Cheers,
Kevin