Соответствующая норма
Belgium
Practice Relating to Rule 14. Proportionality in Attack
Section A. General
Belgium’s Law of War Manual (1983) states:
An attack against a military objective must not be launched when it is to be expected that such an attack will cause incidental loss or damage to civilians and civilian objects which would be excessive in relation to the concrete and direct military advantage expected. 
Belgium, Droit Pénal et Disciplinaire Militaire et Droit de la Guerre, Deuxième Partie, Droit de la Guerre, Ecole Royale Militaire, par J. Maes, Chargé de cours, Avocat-général près la Cour Militaire, D/1983/1187/029, 1983, p. 26; see also p. 28.
Belgium’s Penal Code (1867), as amended in 2003, provides:
War crimes envisaged in the 1949 [Geneva] Conventions … and in the [1977 Additional Protocols I and II] … , as well as in Article 8(2)(f) of the [1998 ICC Statute], and listed below, … constitute crimes under international law and shall be punished in accordance with the provisions of the present title … :
22. intentionally launching an attack in the knowledge that such attack will cause incidental loss of life, injury to civilians or damage to civilian objects … which would be clearly excessive in relation to the concrete and direct overall military advantage anticipated. 
Belgium, Penal Code, 1867, as amended on 5 August 2003, Chapter III, Title I bis, Article 136 quater, § 1(22).
Belgium’s Law concerning the Repression of Grave Breaches of the Geneva Conventions and their Additional Protocols (1993), as amended in 1999, provides that it is a crime under international law to launch
an indiscriminate attack affecting the civilian population or civilian objects in the knowledge that such attack will cause loss of human life, injury to civilians or damage to civilian objects which would be excessive in relation to the concrete and direct military advantage anticipated, without prejudice to the criminal nature of an attack whose harmful effects, even where proportionate to the military advantage anticipated, would be inconsistent with the principles of international law derived from established custom, from the principles of humanity and from the dictates of public conscience. 
Belgium, Law concerning the Repression of Grave Breaches of the Geneva Conventions and their Additional Protocols, 1993, as amended in 1999, Article 1(3)(12).
Belgium’s Law relating to the Repression of Grave Breaches of International Humanitarian Law (1993), as amended in 2003, provides:
War crimes envisaged in the 1949 [Geneva] Conventions … and in the [1977 Additional Protocols I and II] … , as well as in Article 8(2)(f) of the [1998 ICC Statute], and listed below, … constitute crimes under international law and shall be punished in accordance with the provisions of the present title … :
12. intentionally launching an attack in the knowledge that such attack will cause incidental loss of life, injury to civilians or damage to civilian objects … which would be clearly excessive in relation to the concrete and direct overall military advantage anticipated. 
Belgium, Law relating to the Repression of Grave Breaches of International Humanitarian Law, 1993, as amended on 23 April 2003, Article 1 ter, § 1(12).