Соответствующая норма
Practice Relating to Rule 10. Civilian Objects’ Loss of Protection from Attack
Section B. Situations of doubt as to the character of an object
Germany’s Military Manual (1992) provides: “An objective which is normally dedicated to civil purposes shall, in case of doubt, be assumed not to be used in a way to make an effective contribution to military action, and therefore be treated as a civilian object.” 
Germany, Humanitarian Law in Armed Conflicts – Manual, DSK VV207320067, edited by The Federal Ministry of Defence of the Federal Republic of Germany, VR II 3, August 1992, English translation of ZDv 15/2, Humanitäres Völkerrecht in bewaffneten KonfliktenHandbuch, August 1992, § 446.