I'm at a loss here. I'm sending a get request for order details, then making a PO from them. I'm getting an unexpected error when it goes to save the record. In my experience it's usually a stupid mistake that causes this error, but I cannot for the life of me figure it out. I'm logging all of the values I'm setting, and everything looks fine. The code's in the comments.

the usual is making sure you can manually make the same purchase order in the ui

Confirmed that is working, yes

finally, start removing fields until you find the problem one

Thanks @battk