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PreventDefault() in javascript web resource working in Dev but not in UAT

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Hi All,
I am working on a model driven app. I have a javascript code that allows the form for table A to be saved only if it has a matching record in table B. If not present in table B, i am preventing the save operation by using Preventdefault(). This code is working fine in the Dev Environment, but once its deployed to UAT and even in Prod, its not working. 
i get the notification that there is no matching entry, however, the preventDefault() in the immeediate next line seems to be not working. 
Has anyone faced such issue or has any idea on how to resolve it?

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