So I’m pretty sure that’s what your problem is. But I don’t know how to fix it. I see some of the same things in our system if I look. I have old job, with wip records sitting out there, and both move and adjust wip don’t work.
I think some of goes back to this thread (sort of related, but not quite what you are dealing with)
I think you might have to just close your job and rebuild if you have to get rid of that operation. Or you can just complete it with no labor on it and move on.
update: If you close your job, the WIP will get cleared out. Then you can re-open it. I can’t test the delete though, because my operation has labor.