@PolarGoose—thanks for all your responses and adjustments to the code. I think I have everything working the way I want it now.
In the IPTC Tags reference you linked to it shows:
103 OriginalTransmissionReference string[0,32] (now used as a job identifier)
184 JobID string[0,64]
So it seems that in the IPTC standard they have created a rather confusing naming convention for OriginalTransmissionReference and JobID.
One last question: I wanted to rename a couple other columns in Dopus. I went into the exiftool-columns.js file and made the changes there, and it seems to work fine, but I wanted to double check with you if that's okay or if it's likely to break something in the code.