Symptom
Receive a message “The sign of the Amount to Cancel must match the sign of the Ordered Amount which is Negative” when attempting to cancel a negative item in a purchase order. After the error message, you can change the .99 to a negative, but then you receive a message “The ($0.99) cannot exceed the Ordered Amount minus the Previously Invoices Amount minis the Previously Cancelled Amount of $0.00. If the Ordered Amount is negative, absolute values are used in the calculation. Click Yes to set the ($0.99) to $0.99 or No to enter another value.” If you click Yes, then you get the previous message, and it continues through that loop. If you click No, it presents the same message again.