Export to Excelsheet download : 403 access forbidden

Hi All,

Export to excel has been implemented in OData service level itself and trying to download the file by redirecting to the path from SAP Ui5 coding as follows:

exportAll:function()

  {

  var that=this;

  that.busyDialog.open();

  var oModel = new sap.ui.model.odata.ODataModel("/sap/opu/odata/SAP/ZEXPORT_SCN_SRV/");

  oModel.read("ExportSet",null, [], true, function fsuccess(data, response) {

  that.busyDialog.close();

  window.location.assign(data.results[0].Url); /** data.results[0].Url retrieves the path: "/sap/zcustom/Z_EXPORT_USER/export_20160130195157.xls" **/

  }, function ffailure(data, response) {

  that.busyDialog.close();

  alert("Service Call Failed");

  });

  },

The above piece of code is downloading excel sheet with SAP development system user (Developer Access role) in both Internet explorer & Chrome browser.

But, the same piece of code is not working with SAP Production system user and throwing 403 access forbidden as below:

Please suggest what kind of authorization normally requires for a production user to execute export to excel sheet download ? 

Thanks in Advance.

Cheers,

Hemagiri Seerapu