bcp -n -E fails on identity column

Using the bcp -n (native file format) and -E (retain identity values) options together produces:

    Msg 20053, Level 4
    Requested data conversion does not exist


I see this happening on Sybase (11 & 16) and MS SQL 2008.  


Test to reproduce:

    select id_col=identity(5) into tempdb..tbl   -- Sybase
    select id_col=identity(int) into tempdb..tbl  -- MS SQL

    $ freebcp tempdb..tbl out tbl.bcp -S $DSQUERY -U usr -P pw -n -E

    Starting copy...

    Msg 20053, Level 4
    Requested data conversion does not exist

    bcp copy out failed

datacopy also has a problem with the -E option, I assume the problems are related.

John