FNMA does not require the posting of listings in an appraisal report. However, certain client's do... Therefore, it is not a question of what FNMA wants, but what the client wants. To the best of my knowledge, FNMA is silent on the issue.
For Instance, Wells Fargo (RELS) states that they require presentation of "two relevant current pending sales and/or active listings to support the final opinion of value. The use of pending sales are preferred, however, active listings may be utilized when relevant pending sales are not available".
Seems like a good policy to me. At least it can be presumed that a pending sale, adjusted for a market derived SP/LP ratio, shows an action of a buyer (having made an offer), whereas an active listing (similarly adjusted) exhibits no actions of buyers whatsoever, EXCEPT that it for some reason, it has not sold yet.