You can read how to create a credit invoice here.

You can read how to cancel a credit invoice here.

You can read how to credit a supplier invoice here.

You can read how to credit an expense invoice here.

You can read how to cancel a supplier invoice here.

If you have closed the invoice viewing window in any of the Register/Authorize supplier invoice procedures, you can click the Show invoice image button to open the window again.

If you have only minimized the invoice viewing window, you can open it by hovering your mouse over the Monitor icon in the task bar and click the invoice image window.

Sometimes if you have switched screens, or e.g., from two screens to a laptop, the computer may be displaying the invoice viewing window on a screen which is no longer connected. If this is the case, you can hover your mouse over the Monitor icon in the task bar, right-click, and select Maximize on the invoice image window.