You may be trying to change the content by double-clicking on the invoice in the Memorized Transaction list. You can't change the content of a memorized invoice (or any other memorized
transaction) from the Memorized Transaction list.
To do this task
Go to the Lists menu and click Memorized Transaction List.
Select the memorized invoice from the list.
Click Enter Transaction in the lower left corner of the list.
In the memorized invoice window, make the changes you want.
Go to the Edit menu and click Memorize Invoice.
Indicate whether you want the new memorized invoice to replace the previous one.
Troubleshoot invoice problems