Update fails when using linked server (MS SQL SERVER)

Hi,
I am working on the database DB1 and have created a linked server to a database DB2. I have the login and password to access the remote server. The user has access to insert, update and delete data on the remote server. When i connect to the linked server and try to update an existing row I get the following error. What could be the problem??

Server: Msg 7306, Level 16, State 2, Line 1
Could not open table '"PWALLET"."DBO"."PW_TBL_REDEEMPOINTS"' from OLE DB provider 'SQLOLEDB'. The provider could not support a row lookup position. The provider indicates that conflicts occurred with other properties or requirements.
[OLE/DB provider returned message: Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done.]

The SQL I'm trying to execute is

UPDATE DB2.remoteuser.DBO.tablename
SET column1 = column1 + 200,
UPDATED_DATE = GETDATE()
WHERE colume2 = 2181


Please help.
Regards,
P.C. Vaidyanathan