Invoice History and change traceability

Just today, I had a customer send me information that required modifying and resending an invoice (that has already been sent).

1) There was a change in the invoice amount.

2) There was the addition of a PO number (previously it was blank)

This created several traceability issues:

A) There is no way to easily see exactly what the invoiced looked like the first time we sent it (after it has been edited). (I work around this by always attaching a PDF copy of the invoice to the email sent to the customer and always CC myself so that I have a copy, too).

B) There’s no way for me to know why the invoice was edited and resent.

These issues have been raised before, but I figured that making a note of my problem/use-case, right as it’s happening would be of value.

Again, my suggestions would be the following:

i) When an invoice is sent to customers, a copy of it should be stored in harvest so that it can be viewed as it was sent to the customer.

ii) It should be possible to create custom notes in the Invoice History explaining why an invoice is resent.

ii) If I edit an invoice that has already been sent, Harvest should prompt me to include a comment about the change and include this in the history. Bonus points if harvest does automatic differencing/change-detection to create a default log entry with a list of changes (e.g. “PO Number changed from ‘blank’ to ‘ABC’.”, or “New Line Item Added: yada yada”)

Thanks,