FIX: Multiple "LEFT OUTER JOIN" in FROM Clause May Cause Error

SYMPTOMS

   select authors.au_id
   from
   (((( authors
   left outer join titleauthor on authors.au_id=titleauthor.au_id)
   left outer join titles on titleauthor.title_id=titles.title_id)
   left outer join authors a1 on a1.au_id=titleauthor.au_id)
   left outer join roysched on titles.title_id=roysched.title_id)
   where (roysched.royalty = 20)