I don't understand why you would modify the opinion when the aggregate is immaterial! From Roger:
An auditor discovers several immaterial errors that the auditor determines do not, individually or in the aggregate, cause the financial statements to be materially misstated. The auditor proposes adjusting entries to the client, who refuses to correct the errors. Which of the following best summarizes the steps the auditor should take?
A) Document the errors and the conclusion that the financial statements are free from material misstatement
B) Withdraw from the engagement because the client’s refusal to correct the errors is a scope limitation
C) Issue a qualified, “except for” opinion on the financial statements because the client refuses to correct the errors
D) Correct the errors on the client’s behalf, and then issue the audit report
They are saying the correct answer is C. But if the statements are still materially accurate, why would you modify?