How to correct assignment data for worker using spreadsheet template

Summary

How to correct assignment data for worker using spreadsheet template

Content

I am trying to correct worker assignment data using a spreadsheet loader for a specific effective data.But when I try to upload this data for a specific effective date person number and assignment number it gives me an error saying duplicate row processed which probably indicates that its trying to add this row while I intend to correct existing effective dated row.Can someone please suggest as I should go about this.

 

I have also attached the template I used to correct the worker assignment data .

Version