According to the Sale of Goods Act, 1930, a stipulation in a contract of sale with reference to goods…

Section 12(1) of the Sale of Goods Act says a stipulation concerning the goods may be a condition or a warranty. Warranty is the available statutory category here. Under section 12(3), a warranty is collateral to the main purpose and its breach ordinarily gives damages rather than a right to reject the goods and treat the contract as repudiated. The question says "may be", not that every stipulation is necessarily a warranty.