Hi Praseena,
You should go through these documents to understand more about Etags: http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/a004b815-e3bd-3210-f787-8c0b3c7c6d4c?QuickLink=index&…
The error you might be facing due to conflicts.
http://help.sap.com/saphelp_smp305sdk/helpdata/en/e5/033aa25c67486ab06505f565bf6f9f/content.htm
Regards, Midhun
SAP Technology RIG