Section 6(3)(f) in The Bureau of Indian Standards (Recruitment to Scientific Cadre) Regulations, 2002
(f)The candidates belonging to any of the Scheduled Castes or the Scheduled Tribes or Other Backward Classes, may to the extent the number of vacancies reserved for the Scheduled Castes, the Schedule Tribes and Other Backward Classes cannot be filled on the basis of the criteria laid down in clause (e), be selected by giving relaxation to make up the deficiency in the reserved quota, subject to suitability of these candidates for selection.