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When upserting record using Apex Data Loader for an object that has an external id field, if the value for this external id field is not provided in the csv file or while mapping fields from the csv file to the Salesforce object fields, then the upsert will always fail as the external id is a required field.

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When upserting record using Apex Data Loader for an object that has an external id field, if the value for this external id field is not provided in the csv file or while mapping fields from the csv file to the Salesforce object fields, then the upsert will always fail as the external id is a required field.






 
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