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Restrict adding duplicated items

Hi Power Apps Community,

I am creating an app which is filtering the data in the Gallery against that user who is logged in.

I would like the users to add items to the SharePoint list - which is currently working, however they should be restricted into only being allowed to add a particular item once. Is this possible in Power Apps?

I would really appreciate any assistance.

Thank you in advance.



This actually worked perfectly for another app of mine where the item was selected from the Gallery.

Marking this as a solution as well because this is a valid solution for the topic. 

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