I have a credit memo on A/R that was applied and I don't understand why it is still appearing on A/R.  The transaction history shows 2 invoices.  1 invoice with a 0 in credit balance column and the 1 that appears on A/R report showing the full amount in the credit balance column.  The credit memo is from a prior year.  How can I remove this credit memo without affecting prior periods?  Thank you in advance.