Yes, voiding the invoice lets you open the sales order and make any correction you need to do. there is one exception: If the sales order has any open line items (back orders), you will not be able to void the invoice. You will have to temporarily set the remaining qty in the sales order to 0, close the order and then void the invoice.

I voided the invoice and reopened the SO  to find all the line items at zero.  We went into the lines items to put the amounts back in plus the sales tax, we printed a new acknowledgement and everything is correct. However, the deposit is not showing up on the invoice.   After I posted the invoice I went back to AR-A to see how it posted and realized the original invoice is still there.  Doesn't voiding an invoice delete it.  Now my customer account shows two invoices for the same order.   Any suggestions???
 
Jere'