S. 40(a)(ia) : Amounts not deductible-Deduction at source-Rent-Mentioning of wrong section-Does not absolve assessee of liability for failure to deduct tax at source-Disallowance sustainable-Payment to contractor-Truck drivers and transport agencies-Assessee to be granted opportunity to produce Permanent Account Number details before the Assessing Officer. [S. 194C, 194 IA]