Related Rule
Austria
Practice Relating to Rule 14. Proportionality in Attack
Upon ratification of the 1977 Additional Protocol I, Austria stated: “Article 57, paragraph 2, of Protocol I will be applied on the understanding that, with respect to any decision taken by a military commander, the information actually available at the time of the decision is determinative.” 
Austria, Reservations made upon ratification of the 1977 Additional Protocol I, 13 August 1982, § 1.
Austria further stated:
For the purposes of judging any decision taken by a military commander, Articles 85 and 86 of Protocol I will be applied on the understanding that military imperatives, the reasonable possibility of recognizing them and the information actually available at the time that decision was taken, are determinative. 
Austria, Reservations made upon ratification of the 1977 Additional Protocol I, 13 August 1982, § 4.