Hi,
You will need to grant the user (SYSTEM) access to the schema. Unless the user has access, it will not the listed in the catalog for the user.
grant execute on schema _sys_afl to system
should do the trick to grant access to the user system. But, better would be to assign the role for the specific library (PAL or BFL) to the user.
grant AFL__SYS_AFL_AFLPAL_EXECUTE to system
Regards,
Dinu