Appraiser says can't use income approach on FHA HELP

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An appraisal is today. He has warned agent to not be surprised if it does not appraise high enough due to no comps (small town). He says he is not allowed to use income approach per FHA.

I looked in the single-family FHA guide and it sure does talk about using it. This is multi family but don't see why it would be any different.

Any help?

Any links ?

Thanks!