AR - Adjusting Customers with negative total balance

Hi,

We have a number of customers with a negative balance due to refunded payments - we would like to adjust these off as the appear on the Aged report, but although they have a total balance, there is no line, tax or freight balance so when you try to adjust using Invoice Adjustment you get an APP-AR-11503 error saying the balance needs to equal zero & if you try to run Auto-Adjustment the program errors.

A number of customers also have a negative total balance, but they also have an amount in the line & tax fields & they adjust off with no problem.