Cancel an issued invoice

If invoice has already been issued and sent to customer, you need to issue a new credit note. You should not modify already sent invoices!

1. Open the problematic issued invoice and remove all of its items.
2. Update the shipping and financing costs to zero.
3. Change status of the issued invoice to canceled.
4. Change invoice's delivery note status to canceled.
5. Delete shipping list:
   
6. Delete packing list (flow is the same as for deleting shipping list)
7. Go to the Packing work order and open it's material flow.
8. Find all of the write-off documents: 
   

   

9. Open each write-off and cancel it (this will remove write-off transactions from database):
   

   

10. Material is now back on packing work order. Do with it what is necessary.