While using Elorus, users may associate credit notes with
sales invoices to denote the credit source on the resulting PDF.
This correlation used to impose a few restrictions that have now been
lifted:
Credit notes may now be voided despite being associated with sales invoices
The related invoices may now be reverted to draft, as long as the
credit note is also a draft or has been voided
The related invoices may now be voided, as long as the
credit note has also been voided