How to select data from a view (V_5UBI_B)

The following SELECT won't compile. The compiler gives the message "'V_5UBI_B" is not defined in the ABAP Dictionary as a table, projection view or database view". I can run SE11 and enter it as the name of a view and pull it up so I'm obviously missing something.

SELECT SINGLE ercst
    INTO (p_covered_rate_out)
    FROM V_5UBI_B
    WHERE barea = '01'
      AND bplan = p_bplan_in
      AND bcost = '0001'.