I'm trying to use the Migration Tool to update my records, but for some reason it is not working for me.

I made a Test application with 4 columns.

Emloyeenumber 

Firstname

Lastname

Age

This application has 4 records.

After that i update my excel sheet and add 1 more record and change the age of 1 record.

Than I start the migration tool and open the xls file and select "Add data to existing application"

After login I select the correct Application, Select the Form.

Now this is the confusing part: Update Action:

Update record when

Than I can only select ID and Match one of the Excel fields.

I tried to add the ID field to the xls file, but this did not work ether. I get a update success message but the data is not added to the application.

Can someone explain how to make sure the data is correctly updated?