Write Off the Short Payment Made by Customer

It is more appropriate to create a journal entry than a credit memo since a credit memo is issued only if there is a valid credit claimed by the customer.

1. Navigate to Transactions > Financial > Make Journal Entries

2. Debit Miscellaneous Income
    - Amount: enter the amount short paid by the customer
    - Memo: enter notes
    - Name column: choose name of customer

3. Credit AR Account
    - Amount: enter the amount short paid by the customer
    - Memo: enter notes
    - Name column: choose name of customer

4. On the Invoice click on Accept Payment button
    - On the Apply tab > Invoices subtab > Payment column > enter amount short paid by the customer.
    - On the Apply tab > Credits subtab > check the Apply box for the created journal entry.
    - Save.