I have a sync enabled, editor tracking enabled dataset. The dataset has a "date_edited" field from when it was first created and edited in 2013-2014. I want to be able to migrate those dates over the the "created_date" field that was initialized when I enabled editor tracking. There should only be one edited date field, so I want to delete the old field. The problem is, when I try to calculate the created_date field in Pro, I get a 999999 error and "Field is not editable." I made sure it wasn't read only, but the issue persists.