Sage 100

A prepayment was incorrectly made, and due to some confusion was also entered in negatively so it shows up as a positive number in the aged invoice report. Is there a way to delete a PP or reverse it? This is on the A/R side. Thank you.

Is there an easy way to populate the lines of a Credit Memo in order to reverse a wrongly posted invoice? We had some large invoices that were wrong so we want to back them out but it's very time consuming on these large ones. Thanks!