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Error with UPSERT - dupicate value found:

Hello All,


I am running into an issue using UPSERT on Account object, with a custom field being used as External Id as well as Unique. When I run API with a bunch of records I get the error message like the one below, on some of the records


dupicate value found: External_ID__c duplicates value on record id: 0018000000ZdFWC


I searched for similar messages on the forum and found that an issue pertaining to this was fixed on 02-26-2009. http://community.salesforce.com/sforce/board/message?board.id=apex&thread.id=12968&view=by_date_ascending&page=1 


But I am still getting this error. Can one please help me resolve this. 


Thanks in Advance,

Ramana Maddikunta