[SOLVED] How to avoid submit duplicate requests

[SOLVED] How to avoid submit duplicate requests

Hi
How to avoid submit duplicate requests with the same subject by requester 1?

 Scenario:
a user record duplicate requests ( with the same subject ) in one day.
Also merge duplicate requests, it will take long time to handle them by technicians.
There is a script or way to get the user's request status for a specific subject in today?
When he/she try to submit a new request  with the same subject,  How to avoid submit duplicate requests with the same subject for the user!?

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