If a wrong amount is entered either in the Journal or in the Subsidiary Books it is called error of Commission. Trial Balance will tally because the same amount (though wrong) will be posted in both the accounts affected by the transaction.
What will be the effect on Trial Balance if a purchase return of ₹ 5,000 has been wrongly posted to the debit of Sales Return Account but correctly entered in the Customer's Account?
Answer
The Debit Side of Trial Balance will be more by ₹ 10,000.