Identify the applicable accounting convention for the following business scenario and explain your choice

The Morrison Company receives much of its revenue from those customers who buy or rent furniture and appliances on the installment plan. Because the company uses an accrual-based accounting system, revenue is recognized at the point of sale, even though cash comes in on a monthly basis from customers. Lately, the company's accountant is questioning the use of the accrual basis for recognizing revenue, because several customers have defaulted on their contracts, causing problems in the accounting system.