Help to enable duplicate data checker option in excel sheet

Sir can’t submit more than one ID number in National ID Number option of my Kobotoolbox form. That is, I want duplicate data not to be submitted. Just typing the NID will bring up the message it has been previously submitted. It would have been helpful if you had enabled this option in my excel form. Because I can’t turn on the duplicate checker.

Public Information Collection Form.xlsx (6.0 KB)

@mdnurnabi, you will need to learn how the dynamic data attachment works. Once you do that, this post discussed previously should help you solve your issue: