Invoice Heading - System Option (Changing Acknowledgment to Invoice)

>Utilities>System Options>Order Entry>Invoices>

Category-Reporting

Type- Can be Global, Assigned or User 

Order Entry defaults to printing the word Invoice for customer invoices that are Job Costed.  Otherwise, Order Entry will print the word Acknowledgment at the top.  

To always have the word Invoice to print, regardless of the status of the order, click Always Invoice.