Invoice text that added at the preliminary stage of the customer invoice is not viewable once the invoice is printed. 

Invoice text can be added or edited only when the invoice is in Preliminary state. Once Printed, no invoice text can be added or edited. This is to make sure that nothing will change after printing the invoice.

After printing the invoice, Invoice text only can be found at the bottom of the printed invoice as the ending text. This cannot be found in the application once printed. This is the intended behavior of the application.