Hi Nic23,
Thank you for your post and welcome to the Community Forum.
Regarding your concern, a credit note is a different from an invoice and is generally issued after an invoice has already been issued by the seller in the buyer's name. An invoice details the amount due to the seller for the product or services provided by it to the buyer. a credit note serves as a negative invoice.
If you need further assistance with this, please feel free to post again. We are happy to assist you.
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Kind Regards,
Cel