Input-output norms require imported inputs to match those used in export manufacture, enforcing proportionate use. SION A-3681 prescribes that 1 kg of Methyl Cobalamin JP (Mecobalamin) corresponds to 0.95 kg of Vitamin B12 (Cyanocobalamin) as the permitted import input; applicants must ensure imported goods are those used or required in the export product and that input quantities conform to the FTP schedule's proportion determinations.