Arthur Conan Doyle is the poster child for the #Wikidata integration of Wikisource. Having such an example is important because it enables to look at all the issues that may arise.
As the process of importing information is under way, it is therefore the best of times to look first for problems in Wikidata. As the Reasonator visualises the information, it is an obvious place to start. Moving the BISYS reference to the external sources is something I am trusted to do so that was an easy one.
What is problematic is the reference of Mr Conan Doyle to so many movies as a "screenwriter". The works he authored have been the basis for the real screenwriter to write his or her script. This practice is not isolated to Mr Conan Doyle, it is suggested that Shakespeare wrote scripts for many movies as well.