S: 145: Method of accounting-Project completion method-Advance from customers-Sale of 54 units-Neither sales were effected nor the possession of the flats were handed over to the purchasers during the relevant year-CIT(A) was not justified in sustaining the ad hoc addition of 10 per cent of the agreed value of the flats and also ad-hoc disallowance of common expenses. [S. 4, 37(1)]