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If we want to check a field and based on that stop user from deleting a record(client side) how we can do that?

wrong approach, do it serverside in the before submit user event

there is an action menu and under that delete button

<@U5TF1GQ20> and if yes how we can show an error to the user?

<https://system.na0.netsuite.com/app/help/helpcenter.nl?fid=chapter_N2997182.html>

lists methods of restricting user events to run on event types

an error thrown from a user event script shows an error to the user

<@U5TF1GQ20> it will not show the error to the user

probably has a back button and whatever message you put in the error constructor