I'm on quickbooks desktop and I could not do the balance forward on the statement;  I've run the balance detail report; the transaction report;  The credit is not found;  When I go to receive a payment for the customer it shows there on their account that they have this credit;

An invoice was deleted AFTER payment was received and then re-created and then re received the payment; The first payment was NEVER deleted and a second one was received; now the customer shows a credit.