I'm trying to upsert accounts records from Oracle to Salesforce. I used External Id and I see the following error while upserting.
Account - Duplicate external id specified: 925566
Based on the above error, I understand that id: 925566 has already existed within the Salesforce. But here I'm performing UPSERT operation, if it exists, it has to perform UPSERT operation based on the id: 925566 right?
Does anyone have idea?