No "Missing Channel" error when missing a _channels.tsv file.

[markromanmiller]

The BIDS spec for motion data specifies:

Data from different tracking systems MUST be stored in different _tracksys-_motion.tsv files, each of which is accompanied by _tracksys-_motion.json and *_tracksys-_channels.tsv files.

However, in the validator, it is possible to have _motion.tsv files without a corresponding _tracksys-_channels.tsv file and not cause an error. Specifically, in the zip file attached, there is /sub-07/ses-stand/motion/sub-07_ses-stand_task-dualWalking_tracksys-PhaseSpace2_motion.tsv but no /sub-07/ses-stand/motion/sub-07_ses-stand_task-dualWalking_tracksys-PhaseSpace2_channels.tsv and there is no error regarding this file.

motion_dualtask_missing_channels.zip

I'd first like to confirm this is an issue, and if so, what's the best way to resolve it. Is it as easy as finding all _motion.tsv files and seeing if they have corresponding _channels.tsv files?

[effigies]

Which validator are you using?

[markromanmiller]

https://bids-standard.github.io/bids-validator/ was what I was using, but https://bids-standard.github.io/bids-validator/legacy/ has the same problem it seems.