Final answer:
Overstatements of assets and income are a greater concern than understatements in audits of sales transactions.
Step-by-step explanation:
In many audits of sales transactions, substantive tests of transactions can be reduced in determining the completeness objective because overstatements of assets and income are a greater concern than understatements. When auditing sales transactions, auditors are primarily focused on ensuring that there are no overstatements that would inflate the company's financial position and profitability. Understatements, on the other hand, might result in understated assets and income which would have a lesser impact on the financial statements.