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Question from Venkatesh on Dec 19 at 2:20 AM Hi all this my client requirement,
In F-28, while making payments, user enters a number in assignment field (for example: 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 please guide me.
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