When you create an invoice to send to a customer, you can either create a product invoice, or a service invoice.
To show both products and services on an invoice, in Sage 50 Professional, you can add a message line for a one-off service item. To upgrade to this variant, leave your details and we'll be in touch.
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Once you've saved the invoice, you can print your invoice and update ledgers so the values appear in your customer and nominal accounts.