Mark invoice sent after payment is posted
One of our customers requires the PDF invoice with zero due AFTER the payment has been applied. If I forget to mark "Sent" before applying payment, Xero will not allow this box to be checked, and I have to remove all payments, mark sent, then enter payments and credit applications again. Since we use the "sent" feature to cross check that we have submitted invoices, this is important. There should be no reason this is not editable after payments; and there are additional features that can't be edited after payments as well, that used to be editable in the old invoicing, like tracking categories. Please reintroduce this post-payment editability on invoice items that do not affect the accounting, just tracking.