Selling a condo? Better hope it’s on the ‘approved’ list

Question: I own an apartment in a condominium development that I am trying to sell. I have a potential buyer who wants to use an FHA loan because of its low down-payment requirements, but he says my project is not on FHA’s “approved” list. That strikes me as somewhat discriminatory, so my question is, does the FHA have such a list? And if it does, how come my condo isn’t on it and how does it get on it? Thanks. W.F