This document shows you the simple step of deleting something unneeded out of Perfection Software.
Voiding Invoices:
Deleting an Unposted Voucher:
Deleting Unposted Payment:
Deleting Unposted Adjustment:
Deleting Unposted Journal Entry if Manually Created:
Deleting a Customer:
*MFR: 5.1.11.1 Vendor 5.1.10.1 - as with the customer, so also do the MFR and VENDOR.