Thanks for the response.

If I were to go that Invoice and select Control D, would there be a difference from the "Void" process you've described, like not bringing the Sales Tax credit forward?

Does "Void" (without Backup) delete the Invoice, so if I look through my invoices numerically, that numbered Invoice will be missing?

If I do a "Back Up and Void", will that process choice leave the invoice in its numeric order, perhaps marked "VOID" so it can be viewed clicking through invoices? Will it leave it fully viewable, in its original form, in the customer's transactions, so that when it's necessary to see what was done at the customer's premises, there's that Invoice's full record?

What does Back Up do, toward allowing one to see that Voided Invoice in its original form and detail? Where would iy be, if not where it was findable before the "Back Up and Void" process took place?