When entering a finder number on a row within a Revenue batch where a finder number was already entered, the Designation field is not updated with the correct Designation.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.
WORKAROUND: Rather than entering the new finder number on top of the existing one, highlight the row and select delete, then enter the correct finder number. Since the row is new, the correct designation is then populated.