A manual credit note is used when you want to credit a partial amount of the invoice.
If you need to cancel the invoice for a booking/extra, you should rather reopen the account in order for the system to automatically pass the credit note.
Remember that when you reopen an account after an invoice has been generated, the system will automatically generate the invoice for you.
Search for the client and click on their name

Click 'Add'

Complete the fields for the transaction
- Chose 'Credit Note' as the type of transaction.
- Choose the date.
- Add an amount.
- Add the reference.
- Click 'Save'.

View Transactions
You can see all transactions under 'Edit client'. You will see the credit note entry added as a transaction.
You cannot generate a manual credit note.
If you receive the following message:

This means that the credit note was manually added and is not associated with an invoice. This means that if you need the document, you will need to manually create it as the system does not have the data required to create the document from the available data.