During an audit, if an auditor encounters a situation where the company's records are incomplete or there has been a significant scope limitation that prevents the auditor from obtaining necessary evidence, they may issue a disclaimer of opinion. This indicates that the auditor does not have sufficient basis to form an opinion on the financial statements.
Due to the loss of several key financial records in a fire, the auditor issued a disclaimer of opinion, as they could not verify the company's financial transactions adequately.