Interview with a Business Partner tomorrow

For context it's a junior brand manager position in a big transnational company, I've already been in a group assessment, an interview with my boss, done the psychological test and now I have the final interview with the Business Partner.

So I didn't know what this meant until googling right now and realizing this is a HR position? I find it really weird being interviewed by HR last. Also this person apparently is very busy so I think he is higher up than my boss, I don't quite understand the structure here, but what I want to ask is what kinds of questions do you think I'll get? Has anyone ever been in an interview with a Business Partner?

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