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Is there any way to restrict to add duplicate entries to a subpanel under a module

Question asked by Pramod Kumar on Mar 23, 2015
Latest reply on Apr 24, 2015 by Maulik Shah
I'm using version 6.5.
I have created two modules called Fax and Fax_Document_Type. And I created many-to-many relationship with them. But here my problem is Fax_Document_type should be unique under a Fax. How can I do that.