JobHead.FinalOpDueDate - Rest API not setting

We set dates for jobs via the rest API. All worked except the FinalOpDueDate field (aka Final Op)

I’m guessing this is a calculated field or something? Unsure why it’s not setting. Any ideas or solutions out there?

I did a quick query thinking the solution was to join JobAsmbl to JobOper on Job, AsmSeq and JobAsmbl.FinalOpr. I compared that to JobAsmbl.DueDate assuming that was the job’s due date, but in my quick review it seems that is the Final Opr’s Due Date.