Hi Raghu,
It can be one of these.
+ Configuration issue in the backend
+ OData service issue. You have not checked support package level for IWPGW in the frontend server and SAPGWFND(or IWBEP) in the ERP server.
+ UI issue, app versin is not 1.6.14
I think debugging is a faster way to find the root cause.
Regards,
Masa / SAP Technology RIG