DUATS and SIDs

I'd like to use DUATS to plan and file routes that include SIDs, but I find
it often doesn't know about them. For instance, when I try to list the SIDs
for KBED, it says there are none; when I try to list the SIDs for KBTV, it
lists only BTV4.BTV (and it doesn't seem to accept manually specified SIDs
that it doesn't list).

Am I making some mistake, or does DUATS have incomplete data?

--Gary