EX $7-19$ Error in inventory

During $20$Y$5,$ the accountant discovered that the physical inventory at the end of $20$ Y $4$ had been understated by $$42,750.$ Instead of correcting the error, however, the accountant assumed that the error would balance out $($correct itself$)$ in $20$ Y $5.$

Are there any flaws in the accountant's assumption? Explain.