S. 251 : Appeal – Commissioner (Appeals) – Powers –Enhancement- Notional trading loss-Set –off against income under different head –Enhancement on the basis of annual report and statement enclosed to return cannot be considered as new source of income – Disallowance of notional trading loss by valuing shares at lesser amount without any basis and also set-off said loss against income under different head- Enhancement and disallowance is held to be justified . [ 73 ]