generally there is no software that can unpost as posting send it straight to the general ledger. It's a safeguard against shady business practices

We used to use Lankar and had the ability to do this, but it was also an issue as one could completely change the invoice after it was paid and no one would know what was changed, as long as the dollar amounts matched.

But mistakes happen or things get missed, so it would be very, very beneficial for an admin to have the ability to un-post an invoice for corrections, but there should also be an extra note on the invoice stating that it was edited, who authorized it, and when it was done. Maybe some vague summary about what was edited also.

Yes, an admin should be able to reopen tickets for corrections.

yeah this sucks, its very frustrating, our old janco system you could open, fix and re invoice very simple

NOPE! it's super annoying, even support cannot re-open an invoice, you have to credit the whole thing and re-do it. which is a waste of time. there should be an override somehow.. we have been posting invoices as soon as they are done, then a customer comes to pickup later and there's some change needed and can't do it. super annoying. I worked at a Dealership, and the Manager could re-open in invoice for us to make changes, but only as long as it wasn't marked 'paid' .. that was with Reynolds tho..