I’m trying to update some invoices to remove VAT. They’re international orders, but are incorrectly set to include VAT.
So, I’ve created a process to retrieve the invoice, remove the payment, set the invoice to draft. All good so far.
I’ve then PUT the invoice to be updated, and the invoice items have been duplicated.
I’ve found this bug report from 2013!: Update Invoice
was this fixed?
This post makes it sound like it should be possible, but due to the duplication issue, it doesn’t work: Add items to existing invoice via API