If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong

S.68 – Once the underlying amount is recorded in the books of accounts as ‘sales’, ‘profit element’ embedded therein has been offered for tax and such ‘income’ has been accepted by AO, the very same amount cannot be once again added u/s 68 of the Act especially when AO has not doubted the corresponding ‘purchase / quantitative details’.