Anyone know why this payload may be throwing the "You do not have permissions to set a value for element account due to one of the following reasons: 1) The field is read-only; 2) An associated feature is disabled; 3) The field is available either when a record is created or updated, but not in both cases." error? It doesn't match any of the use cases that should be throwing that error. I'm able to key and save the doc with the same exact parameters (other than Ext ID obviously) in the UI and it saves fine. Any ideas?