[Koha] credit memo

Hello, We received several credit memos from one of our vendors and are applying them to an invoice that we owe. Rather than fudging it by pretending the books cost nothing (since we paid with the credit), our Acquisitions Technician would like to enter the real prices of the books and then somehow enter the credit memo. I don't think there is a way to do this. If I'm correct that this isn't possible, can someone think of a good workaround? Karen Kohn Collection Development Manager Education and Sociology Librarian Landman Library Arcadia University 450 S. Easton Road Glenside, PA 19038 ph: 215-572-8528 fax: 215-572-0240