Hi Sam:
Yes, however you should refer to the Data Dictionary Exporter to see which tables are involved. Offhand, I can think of OE Current (header & detail), OE History (header & detail), OE Tax tracking, IC History (not so critical) and possibly Sales Analysis.

It may be better to use GV-RW to delete those records from OE Current (header & detail). First make certain that the invoices are already in OE History. They will, of course, still show up inconveniently in the History list. I've never tried this so I'd like to hear Support's view.