Соответствующая норма
Spain
Practice relating to Rule 66. Non-Hostile Contacts between the Parties to the Conflict
Section D. Refusal to receive parlementaires
Spain’s Field Regulations (1882) states that a commander may refuse to receive a parlementaire only if it would result in an immediate and manifest prejudice to operations or if it appears to be a dilatory manoeuvre. 
Spain, El Reglamento para el Servicio de Campaña, 4 January 1882, § 903.
Spain’s LOAC Manual (1996) provides: “The commander to whom a parlementaire is sent is not obliged to receive him in every case.” 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Publicación OR7-004, 2 Tomos, aprobado por el Estado Mayor del Ejército, Division de Operaciones, 18 March 1996, Vol. I, § 2.6.c.(1).
Spain’s LOAC Manual (2007) states: “Commanders to whom parlementaires are sent are not obliged to receive them.” 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Tomo 1, Publicación OR7–004, (Edición Segunda), Mando de Adiestramiento y Doctrina, Dirección de Doctrina, Orgánica y Materiales, 2 November 2007, § 2.6.c.(1); see also § 7.5.c.