Sales Invoices - Edit the Unit Price and Quantity of a paid/part-paid invoice
Ability to edit the unit price and quantity of both paid and part-paid invoice.
Purpose: Users can easily change the unit price and quantity, especially when their customers often ask for these changes.

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Harold Kyle commented
For a business that takes deposits on custom orders, but then occasionally adds or changes these services during the manufacturing process, this is a deal breaker. Or, for instance, if you take payment on goods but then have to add shipping costs once the order is boxed up. Now imagine if you had deposited this down payment's check in the bank two weeks ago along with 10 other checks. Then, you'd have to remove all the items in that (often reconciled) batch deposit before adjusting the shipping amount on any one of the invoices. Then you have to proceed to deposit and re-reconcile everything again. This can take 20 minutes just to adjust one small aspect of an invoice. This problem renders Xero absolutely unusable for businesses that take down payments.
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Xero Community Team commented
Ability to add/remove line items of a paid/part-paid invoice.
Purpose: To make users easily enter any changes on line items that have paid/part-paid status.