Prevent duplicates on a post ID basis

[Nhus]

Hello, I have a form with two date elements and I did check the “prevent duplicates” option.

My problem is that I noticed that this is form-general because I’m using the form in a sidebar and If the user submit the form in different posts will match every entry of the form.

How do I make it match also by post ID?

Thanks in advance

[Ally]

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