I entered a bill for $3000 and paid it. the vendor called and said the bill was for $5000 and turns out I entered the bill wrong initially.

Since the month was still open I changed the bill amount from $3000 to $5000 which created an open balance of $2000 and then paid it.

My accountant told me I should not have adjusted the paid bill amount but instead created a second bill for the balance due and referenced the original.

Which is a better procedure?