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Ranjan BaralRanjan Baral 

Making data category mandatory in order to publish article

We want to make data category mandatory (at least one)  in order to publish knwoledge article. I understand this is not possible from standard validation rule. can we accomplish this by trigger? Any help is greatly appreciated.
I believe this cannot be accomplished even through code at this moment, we have an idea on the idea exchange if you would like to promote: