Related Rule
Practice Relating to Rule 145. Reprisals
Section F. Limitation of reprisals by principles of humanity
Sweden’s IHL Manual (1991) states:
Under Additional Protocol I, reprisals are permitted only against military personnel. A state acceding to Additional Protocol I thereby accepts a limitation of its freedom to employ reprisals. The [Swedish International Humanitarian Law] Committee believes that this involves a considerable humanitarian advance.
The possibility just recounted – for a party to Additional Protocol I suffering a breach of international law to employ reprisals – is to be considered as a hypothetical case. The Committee strongly discourages such application in view of its manifestly inhuman effect. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 3.5, p. 89.