Modify the operation of Create Invoice so that, upon completing the invoice it will automatically be printed.
Prior to initiating the print process, this modification will set the "Print Invoice" option to "No" so that all of the Inventory and Accounts Receivable updates will be posted but no physical output will be generated.
Upon completion of the print process the "Print Invoice" option will be set back to "Yes" so that any subsequent edits to the invoice will generate a physical copy when printed.