Règle correspondante
Practice Relating to Rule 15. The Principle of Precautions in Attack
At the CDDH, India explained its vote on Article 57 of the 1977 Additional Protocol I as follows:
India voted in favour of this article on the clear understanding that it will apply in accordance with the limits of capability, practical possibility and feasibility of each Party to the conflict. As the capability of Parties to a conflict to make distinction will depend upon the means and methods available to each Party generally or in particular situations, this article does not require a Party to undertake to do something which is not within its means or methods or its capability. In its practical application, a Party would be required to do whatever is practical and possible. 
India, Statement at the CDDH, Official Records, Vol. VI, CDDH/SR.42, 27 May 1977, p. 228.