457 B plans are not a qualified plan meaning they don' t have the same benefits as a standard deferred compensation plan. For examples if the company you are working for is sold, dissolved, or etc you cannot transfer your deferred income to a IRA or another 401 K of a different business. Typically deferred comp plans are only for a certain class of employee in a business and so not all employees are eligible which is one of the reason that are not qualified.
Since I don't know what questions Turbo Tax is asking not sure what info is being requested but I would guess has something to do with your deferral plan still being valid. Is sort of like your deferred income is actually in trust with your employer not the third party entity like a 401 K. It as though you have some equity in your employer business. So the deferral is not just a standard employee retirement benefit, which is reported on a W-2.
