On Fact, it is possible to create a document without an invoice.
Create a credit note without an invoice
from document tab :
Press
button and select credit note
fill in the information required for creation and save
a credit note in "Draft" status is created
produce the credit note by clicking on the "Produce" button
validate the credit note definitively. The credit note is given its definitive number
the following question appears, allowing you to generate a refund-type payment or not
if just approve only: the credit note is validated but the refund is not created; the credit note will have to be settled later, and the document status remains "to be settled".
if Yes to create: the credit note is validated and the refund is immediately created, the document status changes to "paid".
Create a refund
To do this, simply click on the payment card and set the payment amount.