Related Rule
Practice Relating to Rule 22. The Principle of Precautions against the Effects of Attacks
Italy’s LOAC Elementary Rules Manual (1991) states:
To restrict civilian casualties and damage, the means of combat and weapons shall be adapted to the environment of the defence position … When the mission permits, appropriate information and warning shall be given of defence measures endangering civilian persons, so that they can behave accordingly in the event of combat action. 
Italy, Regole elementari di diritto di guerra, SMD-G-012, Stato Maggiore della Difesa, I Reparto, Ufficio Addestramento e Regolamenti, Rome, 1991, § 61.
At the CDDH, Italy stated:
The words “to the maximum extent feasible” at the beginning of [Article 58 of the 1977 Additional Protocol I], however, clearly show the real aim of this rule: this is not a question of absolute obligations, but, on the contrary, of precepts that should be followed if, and to the extent that, the particular circumstances permit. 
Italy, Statement at the CDDH, Official Records, Vol. VI, CDDH/SR.42, 27 May 1977, p. 232.
Upon ratification of the 1977 Additional Protocol I, Italy declared: “The word ‘feasible’ means that which is practicable or practically possible, taking into account all circumstances ruling at the time, including humanitarian and military considerations.” 
Italy, Declarations made upon ratification of the 1977 Additional Protocol I, 27 February 1986, § 2.