SAP FIORI - Data Binding - from ERP to the APP

Hey guys,

I actually have the problem in Sap Fiori, that I can't get the DATA from our ERP. First of all I already connected the back-end with the gateway server

This our our system landscape:

The GWK is the Gateway.

Then I wrote the ABAP Code for the runtime artifacts in our ERP:

Did I do anything wrong with that?

Because when I try to execute the Service in JSON Format I get this result:

TESTKNA1Set is the Serviceimplementation in this case.

And this is the eclipse code:

Do I have to use proxy or the link from above?

Already thank you for helping