Sales receipts, for which no sales invoices have been created may be recorded on the sales ledger via this screen:

Account Ref: Customer account reference.
Currency: For multi-currency setup, customer associated currency, defined iun customer settings.
Date: date of sale / transaction.
Int. Ref.: Internal short reference.
Ext. Ref.: External / customer reference.
Nominal: Nominal Code
Details: Short transaction description.
Tax Code: Tax Code.
Gross: Total amount including tax.
Net: Net Amount - calculated automatically from Gross, Tax Code and associated tax rate.
VAT: Tax amount - calculated automatically from Gross / Net, Tax Code and associated tax rate.
Exch Rate: For foreign currencies, the currently define exchange rate.