S. 68 : Cash credits-Brokerage on sales-Cannot be considered ad bogus-Books of account not rejected-Recovery from debtor-Advance given in earlier years-Cannot be assessed as cash credits-Business advances-Confirmations filed-Short term advances-Leger account and bank statement is filed-Cannot be assessed as cash credits-Payment made to purchase of goods-Not assessable as cash credits-Credit sales-Cannot be assessed as cash credits.