Hello Arun,
concurrency control can be done by the OData engine using the Etag concept ( Operations (OData Version 2.0) · OData - the Best Way to REST ).
HANA supports that since SPS09 (OData ETag Support - SAP HANA Developer Guide for SAP HANA Studio - SAP Library).
You have to enable it in your OData service. In the frontend you have to work that ETag information (e.g. reacting on errors caused by a not allowed change).
Best Regards,
Florian