Unable to change ‘Author’ of ‘Books’

I have tried all the options in admin backend and Permissions plugin somehow I just can’t change the author of the ‘Book’. Any ideas.

[Moderator note: Please, No bumping.]

• This topic was modified 4 years, 7 months ago by Yui.
• This topic was modified 4 years, 7 months ago by Steven Stern (sterndata).