Did you read the posts above? Let me repeat it. Premium Class on NH for domestic flights books into the Y fare bucket. NH only releases 'X' inventory for NH domestic flight awards and no 'I' inventory (biz) as they don't even sell the seat on revenue fares as C, D, J but as a Y (full)fare. Hence even though you are making a Biz redemption all you will be able to get is Eco on inner-Japan flight. Mixed booking classes should be no issue.
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