Accounting Information Systems 7th Edition by Cynthia Heagy,Constance Lehmann

Exercise 6

A company accepts sales orders over the telephone and immediately enters the data. The sales data are accumulated in a transaction file and are processed once a day to update master flies. At that time, a sales journal is also prepared listing all sales transactions for the day.
Required:
What programmed controls would you recommend to prevent and/or detect errors in transaction data?