Once an Invoice has been completed for a Sales Order in Unleashed, the Invoice cannot be edited or deleted. 

To manage an incorrectly completed invoice for a Sales Order, we recommend dispatching the invoiced stock and creating a Credit Note to return the stock and revenue back to your account. 

1. From the Sales Order, create and dispatch a Shipment for the invoiced stock. See Create and manage Shipments
2. In the Sales Order's Invoices tab, hover over the Action Cog on the completed Invoice's row.
   
   
3. Select Credit.
   
   
4. In the new Credit Note, tick the Return checkbox for invoiced and dispatched stock and use the bin icon to remove any invoiced stock that was correctly invoiced from the Credit Note.. 
   
   
5. Complete the Credit Note to return the invoiced and dispatched stock to your inventory. 

For more details on managing shipments and credit notes, see the following help files:

• Create and manage Shipments
• How to process a Credit Note
• Can I delete a Sales Order that has a completed Invoice but no stock on hand available to ship?