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How do you create a pop-up message when a field needs to be populated before saving?

Question asked by Véronica Véronica on Jul 30, 2014
Latest reply on Jul 30, 2014 by Alex Nassi
Hello I am new to sugar, I have a module (X) having a field (Y). I need if that field is empty when saving an error window appears notifying you that you can not save and if the field is filled the changes are saved. I am using Sugar Community Edition version 6.5 
Any idea how to implement this?