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In F-28, while making payments, user enters a number in assignment field

Hi all this my client requirement,

In F-28, while making payments, user enters a number in assignment field (for ex: cheque no). We need to check whether a payment is already made with the same assignment and if so we need to stop the user there it self by throwing an error.

Is it possible through validation?

If it is plz guide me.

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