Final answer:
Auditors should not perform alternative procedures when customers do not return confirmation requests and when confirmations are ineffective or deemed too costly to use.
Step-by-step explanation:
Auditors should not perform alternative procedures in testing the accounts receivable balance in the following situations:
- When customers do not return positive confirmation requests: Positive confirmation requests are sent to customers asking them to confirm the accuracy of their account balance. If customers do not respond, auditors cannot rely on this procedure.
- When customers do not return negative confirmation requests: Negative confirmation requests are sent to customers asking them to confirm if any discrepancies exist in their account balance. If customers do not respond, auditors assume no discrepancies exist.
- When confirmations are deemed to be ineffective as an audit procedure: If auditors have reason to believe that confirmations will not provide reliable evidence about the accounts receivable balance, alternative procedures may be necessary.