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ElenaCaptaElenaCapta 

Problems with Data Loader

Hi,
somebody can help me with Data Loader??
 
I have a CSV file with 4 columns, for example: Id, Name, LastName and Company. The Id isn't the Id of salesforce it's of other application. In the object Lead exist a field that it's a external Id (Idext__c).
 
When I create the map I  I drag de Id column with the Idext__c, and when I INSERT it's work very well but when I change any field of CSV and I test to UPDATE the CSV isn't work. The error message it's:
 
Id not specified
 
What can I do to update the changes if I haven't the Id of salesforce in the CSV?

Thanks!!! and Best Regards

Elena