Previously, credit notes assigned (as payment towards) to invoices could only be unassigned before the order was invoiced. This was because accounting platforms (such as Xero) don't allow us to remove an already assigned credit note allocation via the API (this, sadly, is their limitation, not ours).

You can now unassign these from within Breww, and we'll give you a big warning to let you know that you need to manually replicate this within your accounting software yourself. This way, you can at least correct mistakenly allocated credit notes, even though it's up to you to ensure Breww and your accounting platform are in sync.