Gateway service works in SAP GUI gateway client but not in SAP UI5 model

HI Experts,

I have created a gateway service and when I test the service in the gateway client in SAP gui it works fine.

But when I try to create omodel, no bindings are available...

var oModel = new sap.ui.model.odata.ODataModel(

  "/sap/opu/odata/XXX_srv");

In the javascript debugger there are no bindings...

Thanks for your support.

Best regards,

Christoph