Disable allowed field entry once it's been submitted


Right now I have a conditional code field value where if users enter the correct field value, it will display additional fields.

The values are a data set from a txt file. I was wondering if it was possible to disallow a value once it’s been submitted once.

For example if we had the following codes in the txt file:


When someone submits a form with the code 123 then that code is not allowed to be entered again.

We want to prevent duplicate entries from happening if possible.

Check out GP Limit Submissions. Probably the easiest way to tackle this.

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