The accountant for Bannister Co. posted all amounts correctly from the cash receipts journal to the general

Question:

The accountant for Bannister Co. posted all amounts correctly from the cash receipts journal to the general ledger. However, she failed to post three credits to customer accounts in the subsidiary ledger. How would this error be detected?
Accounts Receivable
Accounts receivables are debts owed to your company, usually from sales on credit. Accounts receivable is business asset, the sum of the money owed to you by customers who haven’t paid.The standard procedure in business-to-business sales is that...