When a film is based on a book, why does that not appear in the writer credits (when not the writer's book)?

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The 1962 movie "The Manchurian Candidate" was based on a 1959 book of the same name by author Richard Condon. But this does not appear in the screenwriter's credits. When I tried to correct that, I was told that was not possible. Why wouldn't an original source be credited? In other entries there is a nod to the source material.
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Lisa Pease

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Posted 3 years ago

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roadrunner

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The Manchurian Candidate 1962 PosterThe Manchurian Candidate (1962)
Full Cast & Crew
Directed by John Frankenheimer
Writing Credits  Richard Condon...(based upon a novel by)
George Axelrod...(screenplay) 
John Frankenheimer...(uncredited)