Somebody had created a pdf file that they wanted to delete but were unable to do so. I was asked to delete it for them and recieved the error message saying that I lacked permission. So I logged in as admin and got the same error message. I even logged on as admin on the computer that created it and it still wouldn't let me. I did verify that I had permission in the workflow and the folder to do this. It is not checked out by anyone. It does allow me to change the state and rename it.