I understand the problem. As I wrote above, credit notes are not an issue. They don't create them in Archive, which is where invoices are created. And if they did, management would want to know.
So I will repeat...
A workaround would be to look at the Application Log to see who deleted an invoice, including the invoice number, but the Application Log doesn't tell you what someone does once they open a batch, only who when opened the batch, and when.
Does anyone have a suggestion?
In the meantime, I'd like to suggest that either the Application Log be expanded to include what was done at the transaction level inside a batch, or to add the "Delete invoice" option under Security Group.
Steve