Guys, any idea about this problem.
Got the reason, as this will be enabled only if both the SA are related to each other. Hence in my case 2 SA are from two different views and it is not related to each other interms of joins.
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Late to this party but you basically found what's written in the documentation. You can not combine subject areas which are not based on the same business model. It's like in normal Answers analysis construction - non-related SAs can only be combined using SET operations (read: UNION requests)
Thanks christian. Got it.