¿Está exento, por el art. 20.uno.26 de la Ley 37/1992, el servicio prestado por un profesional, consistente en la redacción del capítulo de un libro editado por el Colegio de ingenieros de caminos?
La operación citada está exenta al tratarse de un servicio profesional prestado por un escritor, aunque el capítulo escrito sea de carácter técnico.
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