Today, trying upload to jessie-backports from a Jessie jail, I got this message from dput-ng:
$ dput netdiscover_0.3beta7~pre-2~bpo8+1_amd64.changes Uploading netdiscover using ftp to ftp-master (host: ftp.upload.debian.org; directory: /pub/UploadQueue/) running allowed-distribution: check whether a local profile permits uploads to the target distribution `jessie-backports' not in the codename group
To solve this problem, you can edit the /usr/share/dput-ng/codenames/debian.json file and add jessie-backports here:
"backport": [ "stable-backports", "oldstable-backports", "jessie-backports", "wheezy-backports", "squeeze-backports" ],
I hope this help someone.