An online data entry program is used for original entry of vendor invoices. A batch check-writing program occasionally prepares a check for a vendor not yet included in the vendor file. Checks for such vendors contain nonsense characters in the payee field. The most effective programmed control to prevent this kind of error is to perform

1. A record lookup for vendors during data entry.

2. A verification of vendors in the check-writing program.

3. A completeness test on fields in the check-writing program.

4. A batch control total check on vendor payments.

Option 1 A record lookup for vendors during data entry.

Explanation:

Programmers will have the access to change the programs and data files in order to correct the errors. Vendor invoice is the document which shows the amount owed by the receiver to the supplier. On receiving the invoice it has to be uploaded using the accounting software and schedule the payment accordingly.

When data entry is done it is easy to find the errors in the system. The non sense characters in the payee field can be detected using the data entry. So data entry is considered to be the most effective programmed control.