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I guess you will need a CX.
when user enters a value to the node,your CX will get fired.
it will take the current value and check with your database.if value already exists then you have to empty that node in the CX. and show a message that you needs to change the value of node.
Let me know if you need code.
send a mail on firstname.lastname@example.org
I will provide you the code.