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data loader with hidden external id


I have 2 custom objects as dfs and License. license object is look up for dfs object. In dfs, there is an external hidden  id. When i am trying to upsert the dfs file, i was selecting the external id but its files are not upserting and giving an error as external id not specified. 

If i am selecting just the id then its being succeeded but the dfs is showing up without the license number. 


Please help me to figure out this solution for this


Thank you